Multicombo field that works with semicolon-delimited lists

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The multiCombo field type is great for picking from a bunch of values, but only works when the keys are strictly namespaced:

...like thing:foo=yes, thing:bar=yes. The field won't work for fields that like to contain semicolon-delimited values, like thing=foo;bar.

We should make a version of this field that works with semicolon-delimited fields too.

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Just did this.. It's called semiCombo and it works swell 👌