Audio Effects and TimelineClips Update

+Audio jumping fixed for with and without video
+New sound effects.pve file in root should work for all machines, since
File loading defaults to sketchPath
+Limited height of lists so they don't cover each other (can scroll
using mousewheel)
+Renamed variables in preparation to add video effects to timeline.
+Audio clips timeline only shows when video is loaded.
++Audio clips will play whatever's selected in Audio Only Mode.
+TimelineClips now has end time.
++AudioClips will calculate end time as length of sound file.

To Do:
+Implement adding video effects to timeline.
++Plan is to have a popup with start and end textfields video effect
listbox to choose effect.
+Implement saving/loading pve with aud/vid effects.