vimlint and function generator regex support

[davidosomething]

• Changed double quotes to single quotes where appropriate
• Use case matching (even for empty string comparisons)
• Scope function local and script variables
• Abort functions on error
• Rename regex descriptive keys in s:regexs
• Update regex in s:regex to support generator asterisks
• Add test file (manual testing for now)

fix #53

note that it conflicts with #52 but easy merge (just take arrow regex from that one later)

[heavenshell]

Still busy... I'll check this. Sorry for waiting.

[heavenshell]

Sorry for late late response. Merged. Thank you!