Refactor DeleteGenerator action to pretend we've heard about OOP
Generator module: towards consistent and flexible dependency management - prepare to replace referencedGenerator dependency with SDependency
MPS-20075 [build:MPS-135.1098] <null> : Argument for @NotNull parameter 'matchingText' of jetbrains/mps/util/PatternUtil.getIndexes must not be null
MPS-20071: <null> : node has no children. AIOOBE when we expect tree node to have children.
Merge branch 'MPS3.1'