* wip
* move print and JSON functions to modules
* builtin functions are not replacable now
* builtin functions are added for default nil symbol table
* importables: builtin modules and source modules
* refactoring runtime tests
* fix tests
* update documentation
* cleanup
* clean up cli
* fix REPL prints
- add type infos to VM error messages
- add 'Name' to UserFunction objects
- add 'expectErrorString' to VM tests
- replace vm.expectError() with vm.expectErrorString() to make it more explicit
- add source map info to VM error messages
- optimization in function calls
- add file/line/col info to compiler errors
- change stdlib module to be loaded from VM (instead of compiler) so they can be properly loaded after the source is compiled into binary
- VM can take builtin modules optionally
objects/builtin_json.go:
- Added function builtinFromJSON
objects/builtins.go:
- Added builtin function from_json
runtim/vm_builtin_test.go:
- Added tests for builtin function from_json
objects/builtin_json.go:
- Added function builtinToJSON
objects/builtins.go:
- Added builtin function to_json
runtime/vm_builtin_test.go
- Added tests for builtin function to_json
objects/builtin_convert.go
- Changed type check of in case of args[0] failure to always return
args[1] if set
runtime/vm_builtin_test.go:
- Changed tests according to changes in objects/builtin_convert.go
objects/builtin_convert.go: Added defaults to all builtin convert functions except
bool as this one returns false for undefined, instead of undefined.
runtime/vm_builtin_test.go: Added tests for checking default value
behaviour for builtin convert funcs
