Add more quotes to Highlight (Single,Double) Quotes in Selection?

[tangledhelix]

In #42 I added guillemets, etc to the highlighted items, which GG1 didn't handle. Add the same quotes to Highlight Single/Double Quotes in Selection commands. I would probably use different colors to differentiate them (quite probably the color maps from #42 should be re-used). Currently all quotes are highlighted in one color, so even straight and curly quotes aren't differentiated from one another today.

New single quotes:

• ‹test› SINGLE {LEFT, RIGHT}-POINTING ANGLE QUOTATION MARK
• ‛test‚ SINGLE {HIGH-REVERSED-9, LOW-9} QUOTATION MARK

New double quotes:

• «test» {LEFT, RIGHT}-POINTING DOUBLE ANGLE QUOTATION MARK
• ‟test„ DOUBLE {HIGH-REVERSED-9, LOW-9} QUOTATION MARK

The "9" quotes are not used very commonly, but I think it would be useful to highlight them, and in a different color, since they are hard to distinguish from a normal curly opening quote followed by a comma.

@windymilla I'll handle this one if you want to assign to me.

[tangledhelix]

After discussion, dropping this idea.