ninja syntax

Synxtax highlighting for ninja build files adapted from SublimeNinja.

Features

Direct port of SublimeNinja, with minor fixes.

Release Notes

1.0.0

Tweak regex to not match comments following declarations.

Even though the ninja manual does not explicitly state this,
- Comments cannot follow variable declarations (since the # will simply be part of the string)
- Comments cannot follow rule declarations (parser errors occur)
Change regex so these are not mistakenly highlighted as comments.
Configure line comment symbol (#) so editor.action.commentLine etc. will work properly.