dynamic raise statement - resolves #15

[farskipper]

Adding new syntax for raise statements that allow a dynamic expression for the event domain

Original statement:
raise <word> event <expression> [for <expression>] [attributes <expression>]

New additional syntax:
raise event <expression> [for <expression>] [attributes <expression>]

For example:

raise foo event "bar"
// - or -
raise event "foo:bar"

raise event <expression> : <expression> and raise event <expression> <expression> both had parser ambiguities, that's why there is a single expression for both the domain and type.

The domain-type expression is evaluated to a string (using KRL's toString logic) then the domain and type are parsed out separated by a :

[b1conrad]

Looks great! Thanks, Matthew