[tim-janik/beast] Most Bus properties ported to C++ (#78)

I managed to port all Bus properties that have a simple type (non-object, non-sequence) to C++. There are two things worth mentioning here.

(1) in bseapi.idl, we have to use non-computed constants, so there is no elegant way of expressing that the maximum is +24dB - however I think we can live with precomputed factors here

for implementing volume_clamp(), it would be nice if we wouldn't have to duplicate the magic numbers. I originally thought the best way to achieve this would be to be able to access the defaults from the parameter, somewhat like

left_volume = CLAMP (val, p_left_volume::min(), p_left_volume::max())

However, while implementing the code, I've got a new idea: we could simply offer a way to access the bseapi.idl constants, like

Const BUS_VOLUME_MIN = 1.58489319246111e-05; /* -96dB */

should define a C++ constant, also, and this could be used to implement volume_clamp().

(2) I think C++ properties are commonly referred to as "left_volume" (underscore instead of minus) - I however found the introspected paramspecs in the ui code contain minus, so I use a hacky translation for finding the pspec - not sure if that is the right thing to do here.

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