Implement volume handling
- Remove obs_source::type because it became redundant now that the type is always stored in the obs_source::info variable. - Apply presentation volumes of 1.0 and 0.0 to sources when they activate/deactivate, respectively. It also applies that presentation volume to all sub-sources, with exception of transition sources. Transition sources must apply presentation volume manually to their sub-sources with the new transition functions below. - Add a "transition_volume" variable to obs_source structure, and add three functions for handling volume for transitions: * obs_transition_begin_frame * obs_source_set_transition_vol * obs_transition_end_frame Because the to/from targets of a transition source might both contain some of the same sources, handling the transitioning of volumes for that specific situation becomes an issue. So for transitions, instead of modifying the presentation volumes directly for both sets of sources, we do this: - First, call obs_transition_begin_frame at the beginning of each transition frame, which will reset transition volumes for all sub-sources to 0. Presentation volumes remain unchanged. - Call obs_source_set_transition_vol on each sub-source, which will then add the volume to the transition volume for each source in that source's tree. Presentation volumes still remain unchanged. - Then you call obs_trandition_end_frame when complete, which will then finally set the presentation volumes to the transition volumes. For example, let's say that there's one source that's within both the "transitioning from" sources and "transition to" sources. It would add both the fade in and fade out volumes to that source, and then when the frame is complete, it would set the presentation volume to the sum of those two values, rather than set the presentation volume for that same source twice which would cause weird volume jittering and also set the wrong values.
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