FIXED: Emmet: support single quotes

[Alextp]

p[title="Hello world"]
expands OK.

p[title='Hello world']
does not...

[Alextp]

Emmet.pas has 10+ occurs of " constants. so what I suggest, is replace in the abbrev-var string all ' to " and then keep the old code (result don't need ' quotes).

[Rickard Johansson]

Should work in next release (v14.60). Thanks!