Various 020+ fixes. In brief, this commit fixes the following:

- Fix warning for \! inside string - we might be evaluating a macro so it's legal.
- Handle (Dn[.w][*scale],label[.l]) ea case.
- Enable scale value in ea to be expression (evaluated) besides constant.
- Fix for ([address[.wl]]). It seems that undefined symbols were not stored properly in eagen0.s (it used aNexpr instead of aNbexpr when storing base displacement).
- Fixes for fmove freg,freg (no size suffix) and ftst freg (no size suffix).
- fmovem now defaults to .x
- Fixed muls.l