RandomDistributions: explicit parameters for of::random::uniform

[artificiel]

of::random::uniform was exercising perfect forwarding to move arguments into the actual distributions, however this created some ambiguities with zero or one parameters — technically the underlying distribution requires min and max and somehow forwarding nothing satisfied the criteria.

so reverted to explicit T min T max params, with the option of having a single (max) param, which defaults to 1.0 in the case of float — so no implicit "range" for int versions. so:

of::random::uniform(); // returns float (0,1]
of::random::uniform(5.0); // returns float (0,5]
of::random::uniform<int>(5); // returns int (0,5)
of::random::unfiorm<int>(); // does not compile

[edit to add: this does not affect the backward-compatibility of ofRandom() which already wraps explicit parameters]