Emit mlhs with one left child correctly
CLI: Add --skip-until support
Fix on single child MLHS emitter on restarg case
Fix on single child MLHS emitter on mlhs child case
Correct emit of nested rescues
Emit special array index assignment with zero args correctly
Emit undef with many args correctly
Emit next without children inside binary correctly
Handle ensure with rescue child correctly
Emit lvar assign from ambigous method call correctly
Emit standalone rescues within certain parents correctly
Fix CLI bug when source location of quote corrected node leaked into emitter
Better naming for CLI preprocessor helpers
Remove blind spots in preprocessor

* Allow to apply many preprocessors per node
* Also collapse str nodes in regexp
Also collapse str children of xstr nodes
Inverse behavior of standalone rescue emitter whitelist