InPlace RuleEditor stores assignment class in the wrong place

[NochEinKamel]

InPlace RuleEditor stores assignment class in the wrong place

[nullterminated]

I'm pretty sure the in place rule editor never actually worked. I believe I've got it fixed up enough to actually use now without butchering your rule files. Changes include fixing this bug (thanks for reporting), making rules save on a single line for easy git diffing, writing rules to a d2wmodel.txt file as well as rule model file, support for key comparison qualifiers on the LHS, custom selectors with the "key selector: value" format, sorting saved rules by priority, and fixing the priority sorting in the UI.

It still lacks support for rule model groups, there's no checkbox for disabling rules (disabled rules display a RuleIsDisabled = 'YES' in the LHS qualifier), there's still no file association for d2wmodel files, and there's not a nice combo box on the editor like there is on the cocoa version.

But it seems like it should now be usable at least. There's some minor formatting differences on LHS qualifiers, where something like

smartRelationship.isToMany = '1'

becomes

smartRelationship.isToMany = 1

but these look harmless. Since the thing never really worked in the first place, I went ahead and pushed my changes. Hopefully this makes it a little nicer for everyone.