Allocate copies of internal functions inherited in user classes at CG(arena), instead of permanent heap (malloc).

Add smart_str_append for appending zend_strings

Also replaces usages in Zend/ and ext/standard

Use smart_str in get_function_declaration

Instead of custom smart string implementation

Added missed mod str

Split inheritance into separate file

This moves handling of inheritance and interface implementation
from zend_compile.c into a separate zend_inheritance.c file, as
this is not reall

Split inheritance into separate file

This moves handling of inheritance and interface implementation
from zend_compile.c into a separate zend_inheritance.c file, as
this is not really related to compilation.

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