Add overloads for bitwise binary OP ugens

[scottyeager]

In sclang, creating binary OP ugens using the bitwise operators (& and |, at least) is supported. Would be nice to also have this in Supriya, by adding __or__ and __and__ to the overloaded operators.

For example:

@synthdef()
def gated(gate=1, time=1):
    Linen.kr(gate & Trig.kr(1, time))

[josiah-wolf-oberholtzer]

Sounds good to me. Will have this implemented today.

[scottyeager]

Excellent, thanks!