ExplicitArrayFillingInspection: detect cases when for loop can be replaced with Arrays.fill call (IDEA-185394)

IDEA-210618: Reference implementation of PSI visitor for UAST-supporting languages that detects usages of APIs in source code.

Java: Fixed modifiers when extracting method from default or private method in interface (IDEA-211141)

* ChangeListManager.isIgnoredFile now check if file contains in ignored files holder
* move isPotentiallyIgnoredFile to util

as long as it is a current shelter for the Kotlin-utils

ExpressionUtils#getQualifierOrThis -> getEffectiveQualifier, nullable now (cannot construct this expression for outer anonymous class)

Fixes EA-140652 - assert: JavaParserUtil.parseFragment

Add WrapConstant annotation for proper conversion to human-readable values in external formats (Json, editorconfig)

IDEA-CR-45934 introduce DigestUtil to address performance issue - SUN provider should be used always and we don't need to find another one

fixed blinking test

[fragment-editor] a new implementation of `JavaInjectedFileChangesHandler` (IDEA-207632, IDEA-129848, IDEA-195815,

IDEA-149628, IDEA-155740, IDEA-165230, IDEA-172341, IDEA-183487, IDEA-191542)

Still uses synchronous commit and reformat but reformats only changed part which makes it much more fast