Updates to unary and binary operators:
+ Added `is` and `!is` operators
+ Changed `==` and `!=` operators to be strict equality (removed `===` and `!==`)
+ Added `~=` and `!~=` operators for "comparative equality" (using @toComparison)
+ Added `^` and `^=` operators for powers.
+ Added `!like` binary operator
+ Fixed several binary and unary operators to explicitly coerce operands
Adding missing Slot runtime
Removed lazy mode from parser (enforcing strict syntax) and cleaned up parser.
Removed for..in parsing
Made various control-flow structures paren-free.