Update 2020 05 03

Fixes

• Better handling for previous components such as Facebook: https://gitlab.com/gableroux/unity3d/-/issues/62
• Improved documentation
• Automatic injection of android sdk and ndk versions (this may be improved later on, but it's already much better) prepares #71 but it won't close it so far as I did not handle Linux-IL2CPP removal yet
• Updated tests and test snapshots
• Added skip keyword to prevent execution of known failing configurations

New versions

• 2019.3.12f1
• 2020.2.0a9 https://gitlab.com/gableroux/unity3d/-/issues/73
• 2020.1.0b7

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