Enhancements
#71 Support arbitrary types as Map keys
#72 Support if/unless expressions in action of switch expressions
#74 Support use of constant expression strings in switch patterns
#76 Comma separated indices for indexing multi-dimensional arrays
#78 DefaultEnv now has shutdown method for cleaning up thread pools
#82 Add ability for different JactlContexts to have different sets of custom function/methods
Bug Fixes
#73 Erroneous error in switch expression when using 'if' in pattern
#75 Break/continue with a label inside a while loop generates NullPointerException
#77 Parsing error when list appears as first item on line after a type name
#79 Fixed internal compile error "could not find static method castToNumber"
#81 Conditional assignment with ?= fails for bit operations if operand is null