Allow " " and "," in sublime completion syntax's "scope" key
Rename the snippets directory for JSON Syntax Definitions
Remove redundant second "fileTypes" key
Add auto completions for YAML Syntax Def dev

Also generate a uuid for the "uuid" key and auto-extend numerics without a
scope (not in "string") to a capture group with that number as its key.
Inhibit the sublime default word completion when showing the key completions

Also do not auto-complete when the syntax def already matched the current position
(e.g. in a match regexp or scope name).
Provide completions for used keys in the repository for includes