Cleanup dead/duplicate code

Add zend_ast_list* variant to parser stack element

Minor cleanups in AST code

Use separate node type for lists

This saves storing the children count for normal ast nodes.

Store lineno for zval ast nodes more efficiently

Use more specific parser stack nodes

Separate class type and start lineno

Store doc comments in separate stack entry from start lineno

Cleanup member modifier code

Create namespace_name via AST

Make lexer return AST nodes

Add functions for create str/long ast directly

Expose ast via CG(ast)

Port ZEND_BIND_GLOBAL optimization

Implement declare()

Handle __halt_compiler()

__halt_compiler() without haling compiler

Add NS error checks

Those can probably be implemented in a better way now...

Discard NS doc comments

Fix namespace\, maybe

Port top level stmt

Problem: namespace\foo no longer works :/

Partial NS port (semicolon, no errors)

Port constant declaration

Port function/const use

Port use statement