Move library and library-asm to arch/zx48k

Big change here!

This one allows setting architecture (--arch=zx48k, which is
the default) and the includes used will be the one there.

Author: boriel

api/config.py

@@ -69,6 +69,7 @@ def init():
     OPTIONS.add_option('Sinclair', bool, False)
     OPTIONS.add_option('strict', bool, False)  # True to force type checking
     OPTIONS.add_option('zxnext', bool, False)  # True to enable ZX Next ASM opcodes
+    OPTIONS.add_option('architecture', str)  # Architecture
 
 
 init()

arch/__init__.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 # vim:ts=4:et:sw=4:
 
@@ -8,3 +8,5 @@
 __all__ = [
     'zx48k',
 ]
+
+AVAILABLE_ARCHITECTURES = __all__