* all except pol
* pol and includes under defines
* something weird has happened
* remove own folder from include searchpath
* fixed remaining, adapted include style for external headers
* missing include
* POLLOG* macros use the new formatting
removed all old logging functions
* removed old fmt lib from everything except StreamWriter
removed unneeded functions
* fixed review comments
Add:
- ast/ExitStatement: AST node for the exit statement.
- ast/ReturnStatement: AST node for the return statement.
- only handles top-level returns and returns inside program declarations, which do the same thing: progend.
