deavmi / niknaks / #113

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(PR) Predicates with delegate support (#6)

* niknaks.functional

- This is eh, I should just use `std.functional.toDelegate`

* niknaks.functional

- Updated template `Predicate!(T)` to now refer to `bool delegate(T)`
- Added template function `predicateOf(alias f)` where the alias is the function's symbol name. It can be either delegate or functin but must be callkable, then we convert a fucntion to a delegate if need be

* niknaks.functional

- Don't allow any callable, ONLY delegates or functions as the referred-to entity of the alias/symbol

* niknaks.function

- Added some documentation

* niknaks.functional

- `predicateOf!(alias)` now ensurs that the delegate or function has a return type of bool and that it has a single arity

* niknaks.functional

- Removed commented-out old code

* niknaks.functional

- Added missing `isDelegate` import
- Updated unittests

* niknaks.functional

- Remove testing code for a unit test

8 of 8 new or added lines in 1 file covered. (100.0%)

116 of 116 relevant lines covered (100.0%)

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