0.7.0alpha2

Improvements::

* "Run" menu added
* PATTERN RESTORE (ACE) statement added

Bug Fixes::

* compiler: for loop floating point step fixed
* compiler: SINGLE -> INTEGER const conversion fixed
* runtime: restore all non-scratch registers on premature program end (END / EXIT statements)
* ide: SELECT CASE autoformat fixed
* ide: Editor line join folding fixed
* ide: Preserve floating point literals when auto-formatting
* examples: 3dplot fixed