Adds new PowerShell Core escapes e and
u{x} (#60)
#171
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Adds syntax highlighting support for
`e
(escape,^[
or[char]27
) and the Unicode entity escape`u{x}
wherex
is 1-6 hex digits ranging in value from 0x0 to 0x10FFFF.Adds simple tests for both.
Note, invalid use of

`u
will scope asinvalid.character.escape.powershell
I added a new repository item immediately below 'doubleQuotedStringEscapes' so that 'unicodeEscapes' could be reused. (#156 uses the same item 3 times)
(Closes) Fixes #60.