Kotlin perspective added to Eclipse plugin.

 #KT-5355 Fixed
Package and units validation fixed.
Check if unit exists by OS methods, not by eclipse resources.
Update to Kotlin 0.8.232
Merge pull request #49 from JetBrains/fix_compilation

Update to Kotlin 0.8.232
Merge pull request #47 from adkozlov/elements-wizards

Kotlin perspective added to Eclipse plugin.
Change wizards and perspective icons