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sh.lang: Fix a bug and improve "parameter-expansion" context

Gaël Bonithon requested to merge neyfag/gtksourceview:patch-sh into master

When a double quote is escaped in a parameter expansion, e.g. "${var%\"*}", highlighting is broken, because of the absence of "def:escape" reference context in "parameter-expansion" context.

This MR fixes this bug, precises the starting regular expression for this context, and uses different colors for parameter itself and operations performed on it, i.e. ${var…} and %\"* in example above.

I also add a boundary detection improvement forgotten in !94 (merged) (sorry for that).

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