More syntax for define new variables.
Add test case for defer. Modify test case for defvar.
Update README.
Add "loop" syntax for forever loop.
Remove "backtrack" from grammar file.
Optimize alloc syntax, type syntax.
Remove unreachable defer code after return stmt.
Modify test cases.
Update README.md
Add features section in readme.
Fix a little gramar
Implement pattern matching for "For-Each" and "LINQ".
Add test case for PatternMatching. Update test case for class.
Optimize syntax for pattern matching.
Update README.md
Modify syntax of LINQ.
Update README.
Add SugarCpp.Watcher.
Change the priority for infix-function.
Update test case for defer.