* moved the source languages out of assets/ into their own directory (#356)
* split build.gradle into several smaller files
* improved word frequency validation during build time
* slightly optimized dictionary loading speed using pre-calculated file size
* fixed a potential crash when loading invalid assets
* fixed dictionary loading progress starting at 100% then jumping to 0% when manually loading two dictionaries one after another
* documentation update
* validateDictionaries gradle task now makes use of caching for much faster builds
* lowered the severity of missing translations linting rule
* fixed some more errors in the translations
* added linting task to the GitHub CI validation workflow
* enabled GitHub CI validation on push to master
* added a github workflow for closing stale issues
* added github PR validation workflows
* fixed the dictionary validator missing digits in words
* fixed the build failing completely when there no git tags
* updated androidx.room 2.4.3 -> 2.5.0
