Tweak support for Sass maps var type

+ Needed to allow for digits and underscores to be included as "property names"
Fix a few regex match errors in SCSS language definition
Fix JS syntax highlighting for `function()`

+ Previously, params only highlighted correctly if there was a trailing space after function - like so: `function ()`
Misc. package updates
Adding TodoReview package
Use CSS3 syntax highlighting by default for .css files
Update Sass / CSS comment snippets
Misc config/settings updates