Porting simplified require from Phalcon 1.3
CLANG fixes
Fixing json_encode/json_decode optimizers
Fixing get_called_class optimizer
Variables that receive function calls must be initialized to NULL
Fixed scope calling static methods, disabling ternary test
Add Zephir\Builder\Statements\LetStatementBuilder
Fix type - unreachable
ClassProperty remove slash before Zephir when use namespace
Fix docblocks