Added example that triggers exceptions
Throw IrresolvableSymbolException in SymbolResolver
Added custom RuntimeException that overrides stack trace
Added some convenience methods to DefinitionTable
Show custom backtrace with Interpres filename and line number
Throw custom FileNotFoundException for invalid require statements
Added exception handling demo
Rethrow antlr exceptions as runtime exceptions, not sure if best approach
Cleaned up Require#invoke
Added fix for halting executing when parsing fails
Implemented unary operators, bool literals for TAM/JVM
Added forgotten require to bool literals
Let AST be an implementor of AsBytecode as well
Replaced "bytecode" with "instructionSequence"
Return ASTs from core functions instead of actual values
Fixed typo
Removed language.values
Restored #instructionSequence()
Removed stuff from SymbolResolver
Allow -int and +int in grammar