1be9e04797
Add 'kotlin.caching.enabled' flag to switch the caching for all tasks;
Rename and change semantics of cache support checks: make two instead
of one, `isBuildCacheSupported` and `isBuildCacheEnabledForKotlin`;
Remove FileOptionKind entries that are redundant at the moment;
Improvements in BuildCacheIT.kt and other refactoring suggestions from
the review
https://upsource.jetbrains.com/kotlin/review/KOTLIN-CR-1647