Set up project formatting settings
Added wizard for creation Kotlin source file
Configure project Error/Warnings settings

- Enable unnecessary cast warning
- Warning about @Override missing
- hashCode() and equals() warning
Remove accidentally committed binary files
Add empty preferencePages: Kotlin, Compiler, Editor
Implemented simple editor with comments and keywords highlighting
Configure comments formatting
Disable autoformatting on save for projects
Remove warnings and useless comments
Temp library dependency