0e3ff1f970
* Added directives recognition in SM AST. * Moved semi-standard SM `Property` type to separate handler. * Added `const` recognition from SM AST. * Removed redundant `this`-as-identifier recognition. * Removed redundant rules for abstract SM types. * Described `CatchClause` using string syntax. * Added support for semi-standard `range` tuple as location source. * Added back-conversion support (to be improved).