Round out support of latest input method protocols

Bigger changes:

• Synchronize text-input and input-method property changes.
• Ensure text-input v2/v3 cross-compatibility.
• Support virtual_keyboard_unstable_v1

---

TODO:

• Handle virtual keyboard keymap request.
• Add virtual keyboard test.

requested review from @romangg

assigned to @francesco.sorr

added 7 commits

• d0077e04...e051dd4a - 4 commits from branch kwinft:master
• 5d4c0968 - feat(server): sync text input v3 with im v2
• 8329e7b7 - feat(server): sync input method v2 with ti v3
• 13961161 - fix: test text input synchronization

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assigned to @romangg

removed review request for @romangg

added 45 commits

• 13961161...22f229cb - 42 commits from branch kwinft:master
• 36485ca7 - feat(server): sync text input v3 with im v2
• d12164b4 - feat(server): sync input method v2 with ti v3
• 89a59e3c - fix: test text input synchronization

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added 4 commits

• b2a65c36 - feat(server): update text-input v3 from input-method v2
• 201deeaa - feat(server): update input-method v2 from text-input v3
• 9349d5f8 - test: add test for text-input/input-method synchronization
• 6f393c3e - fix(client): name correct input-method grab destructor request

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added 7 commits

• 6f393c3e...2c19a619 - 3 commits from branch kwinft:master
• c1ba909e - feat(server): update text-input v3 from input-method v2
• 16f7da54 - feat(server): update input-method v2 from text-input v3
• 448b805a - test: add test for text-input/input-method synchronization
• 3aadb52d - fix(client): name correct input-method grab destructor request

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added 4 commits

• bd1041f4 - style(server): rename globals text-input v3 variable
• 4293afdd - feat(server): update input-method v2 from text-input v3
• 3a757c80 - test: add test for text-input/input-method synchronization
• 175d0305 - fix(client): name correct input-method grab destructor request

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added 7 commits

• 9bfd49c4 - fix(server): remove unnecessary return statement
• 3d5c541b - fix(client): name correct input-method grab destructor request
• c0bc24f6 - feat(server): provide getter for input-method popups
• 9bc2a0e5 - feat(server): update text-input v3 from input-method v2
• 9c88a1e6 - style(server): rename globals text-input v3 variable
• 27c90acd - feat(server): update input-method v2 from text-input v3
• b9a39bbe - test: add test for text-input/input-method synchronization

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added 7 commits

• 5558d8e9 - fix(server): reset input-method state updates on commit
• 5d77a3f5 - fix(client): name correct input-method grab destructor request
• 8ba9004d - style(server): rename globals text-input v3 variable
• 3b9b1d34 - feat(server): provide getter for input-method popups
• 8f64179d - feat(server): sync input-method v2 state to text-input v3
• 21bd3752 - feat(server): sync text-input v3 state to input-method v2
• d5a43a05 - test: add test for text-input/input-method synchronization

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added 4 commits

• f29a82e7 - style(server): snake-case text-input v2 classes names
• 9a49f522 - style(server): move enums out of text-input v2 class
• a11c6bc6 - refactor(server): introduce text-input v2 state type
• cf3d34bc - style(server): snake-case text-input members

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added 12 commits

• a18c52ad - fix(server): set text-input v3 q-ptr
• 586bea7f - fix(client): name correct input-method grab destructor request
• 8160abf8 - style(server): rename globals text-input v3 variable
• 2b10a94d - feat(server): provide getter for input-method popups
• 3dafa844 - feat(server): sync input-method v2 state to text-input v3
• 9bd92bea - feat(server): sync text-input v3 state to input-method v2
• 150280ae - test: add test for text-input/input-method synchronization
• 76e156b9 - style(server): move enums out of text-input v2 class
• 8eba2ce4 - style(server): snake-case text-input v2 class names
• 6be539e2 - refactor(server): introduce text-input v2 state type
• 3d7e6ff2 - style(server): snake-case text-input members
• e94a0479 - feat(server): sync text-input v2 to input-method v2

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added 8 commits

• 04e33e40 - feat(server): sync input-method v2 state to text-input v3
• 93ba4e2b - feat(server): sync text-input v3 state to input-method v2
• 01c5bbb1 - test: add test for text-input/input-method synchronization
• 2f743608 - style(server): move enums out of text-input v2 class
• d9ff1349 - style(server): snake-case text-input v2 class names
• f70a0a34 - refactor(server): introduce text-input v2 state type
• f295b4c5 - style(server): snake-case text-input members
• d5381557 - feat(server): sync text-input v2 to input-method v2

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added 3 commits

• 82f432f4 - refactor(server): remove resource check on text-input
• bbea1c4a - fix(server): switch between clients with different text-input versions
• 3b4eb86e - feat(server): sync text-input v2 to input-method v2

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added 3 commits

• a7526385 - test: rename text-input tests
• 08385738 - style: use snake-case in text-input v2 test
• 02d28cf3 - test: add test to check text-input version compatibilities

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added 4 commits

• a7934755 - refactor(server): expose key state enum
• 9631fd4d - refactor(server): merge key pressed and released API
• 55d42fd4 - feat(server): add support for virtual_keyboard_unstable_v1
• e1138c08 - feat(client): add support for virtual_keyboard_unstable_v1

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changed title from Sync text input and input method to Round out support of latest input method protocols

changed the description