Fix and Refactor spinbutton toolitem

fixes #690 (closed) and #689 (closed)

image-updated till commit b3537605 13 is not a "standard" value but is 8+5(page) while 8-5=3 is a "standard" value hence is original value and its label is preserved and value uniqueness is maintained at all times.

UI

Page up/down feature exists for fast changes, removed duplicate and out of bounds values labels preserved

Development

Optimized API for densely as well as sparsely labeled data.

Tasks left

• [Done] improve API
  • Currently, two different vectors are used which should be of the same size, make a function that accepts a map(maybe unordered) as the second parameter to add labels makes much more sense where labels are sparse
• [Done] Improve implementation
  • Currently, a vector of pairs is used to store menu, however, std::map with a custom comparator rounded values will be much better for code simplicity and maintainability.

@jhofinger review please

added 2 commits

• 71020bbc - Added clangd to gitignore
• cbfd7423 - Fixed compare function for int params to bool params

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added 1 commit

• 027d2318 - Using maps to store data (for uniqueness and sorting)

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added 1 commit

• 081c3515 - Using emplace instead of insert, assigning defaut values in class declaration...

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resolved all threads

added 2 commits

• 5ff5753e - Improved API (set_custom_numeric_data)
• b3537605 - Improved implementation, removed redundant check

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marked as a Work In Progress

unmarked as a Work In Progress

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