[[ Unicodify ]] Corrected a couple of issues with setsbprop().
[[ Unicodify ]] Added basic (restricted) MCStringFormat implementation for unicode (you can format strings containing %s, %d and %@ - the latter being stringref).
[[ Unicodify ]] Updated setwindowname() to use new MCStringFormat capability.
Merge branch 'refactor-syntax_unicode' into refactor-syntax_unicode_with_string