do not run decompiler during find usages
python perf tests
re-port concurrent maps from jdk9
IDEA-130782 make RemoveUnusedVariableUtil#checkSideEffects Contract(pure) aware
IDEA-95117 Arrangement: Allow to specify 'condition sequences': clean up
external system: print message counter state as an assert message in tests
IDEA-95117 Arrangement: Allow to specify 'condition sequences': add new icon
java-decompiler: minor optimization
showOKMessage: make the only button the default one
IDEA-95117 Arrangement: Allow to specify 'condition sequences': create custom token for rule aliases
IDEA-129208 Settings list: move "Version Control" to a top level node
same param value: suppression check is performed on actual element to warn (IDEA-130862)
Merge remote-tracking branch 'origin/master'