Machine code restructure, models are now machines instead and the init functions are in the machine files rather than in machine.c (former model.c), also moved the machine stuff into the machine/ subdirectory.

src/machine/machine_ps1.h

@@ -0,0 +1,3 @@
+void machine_ps1_m2011_init(void);
+void machine_ps1_m2121_init(void);
+void machine_ps1_m2133_init(void);