Color pattern names can't have `,` (and maybe `:`,`-`)

[todbot]

Color pattern names cannot have certain special characters, most notably commas (,). E.g. you can create two patterns called "Test, one" and "Test, two" and if you select "Test, two" as a pattern in a rule, then "Test, one" will fire.

Reported by user Torsten via email.

(to Tod: this is likely due to meta-pattern parsing. Need to move pattern collection check before meta-pattern parsing, even though this complicates logic flow)