Specify type explicitly quick fix now has lower case of letters (due to naming convention of quick fixes)

Changed RemovePartsFromPropertyFix so it uses SpecifyTypeExplicitlyAction.addTypeAnnotation() instead of AddReturnTypeFix.addPropertyType().

Moved addTypeAnnotation/removeTypeAnnotation methods from refactoring package to SpecifyTypeExplicitlyAction.

MUST_BE_WRAPPED_IN_A_REF was renamed to CAPTURED_IN_CLOSURE (immutable variables are stored there as well)

 #KT-1743 fixed

The commented code fails on CI server

Fallen (because of VariableAsFunctionResolvedCall change) javascript backend tests temporary commented

 #KT-1875 fixed

 #KT-1575 Fixed

 #KT-1623 fixed

Added test for case when type from overridden method has same short name as something already present.

 #KT-1602 fixed

 #KT-1602 fixed

Changed completion for classes, so if they have the same name as already imported, new import is not added. Qualified name is inserted instead.