Attach annotations to the closest prefix expression instead of
whole statement if no new line found after annotations
The motivation is for a simple annotated expression like '@ann x + y'
its syntax form must not change after prepending 'val z = ' just before it
If a block statement starts with annotations treat them as they
belong to node of the statement rather than to the closest prefix expression
#KT-10210 Fixed
Fix a problem where deleting last import directive via "optimize imports" could lead to incorrect psi structure resulting in CCE, see EA-64291
New imports are inserted at the head (after package directive if present) of the file (before any comments) if no imports were present
Add test for inserting import to file where a first statement is a comment
Drop code dealing with non-existing import list in ImportInsertHelperImpl
AbstractQuickFixTest: check for unexpected actions before changes to the file are made as it relies on the first line having specific format
Nikolay Krasko