Source clean-up, portability and debugger fixes. (PR #842)

And fix two general issues:
- confusing behavior when entering the builtin (mini) assembler mode,
- and also fixes the "cl" (clear flag) command - which was documented, but did not work at all (due to an "interesting" command/syntax conflict...).

source/SaveState_Structs_v1.h

@@ -99,7 +99,7 @@ struct SS_CARD_DISK2
 {
 	SS_CARD_HDR	Hdr;
 	DISK2_Unit	Unit[2];
-    WORD    phases;
+	WORD    phases;
 	WORD	currdrive;
 	BOOL	diskaccessed;
 	BOOL	enhancedisk;