Consolidate test frameworks and cleanup, including:
* all tests use Google Test
* reorganize folders, esp. kmnkbd -> api
* move all api tests into api folder
* replace references to test_assert or test_color with gtest equivalents
* leverage gtest patterns to remove boilerplate code
* dramatically simplify meson.build files and localize variables
* move shared helper code into helpers/ folder
* make test names unique and add gtest protocol for reporting back to
teamcity
Fixes:
* CLDR test keyboards had invalid unicodeset escapes (needs to be raised
upstream also) - was not failing tests because files were not loading
but returning success
Test-bot: skip
- split keyboard loading into loading KMX file into blob and then
loading the keyboard processor from the blob.
- deprecate `km_core_keyboard_load`
- move file access next to deprecated method. This is now the only place
that loads a file in Core; unit tests have some more places that
load files.
- introduce GTest and add unit tests for loading from blob
Cherry-picked from `epic/web-core` branch.
Cherry-Pick-Commit: 1deaa323ad
Cherry-Pick-Commit: 59019cc8b7
Cherry-Pick-Commit: bc46458368
Cherry-Pick-Commit: d06aa29956
Cherry-Pick-Commit: 1c88166f6e
Cherry-Pick-Commit: 069cd21ecd
Cherry-Pick-Commit: 052ae2ec35
Cherry-Pick-Commit: 11a2a3ba3a
Part-of: #11293
Part-of: #8093
