Bumping target SDK version up to 33.

Clean-up of java docs.

Update version number and bump up to AndroidX

Merge branch 'master' of https://github.com/Lotame/cc-android-sdk

Merge branch 'master' of https://github.com/Lotame/cc-android-sdk

re-added build gradle file, fixed gitignore

Updates for appcompat-v7-23. Also, bumping the version number.