Enhancement - Add support for content checking and tint color for compose icon

[EvgenyMeltsaykin]

@Unlimity

I ran the command

git ls-files -z | while IFS= read -rd '' f; do tail -c1 < "$f" | read -r _ || echo >> "$f"; done

But too many files have changed. Should I start it now??

[Unlimity]

No need to do this for the whole repo, just for the new files you add in your PR

[EvgenyMeltsaykin]

@Unlimity

Done, please check that everything is fine