server: mapped audio bus for /g_queryTree.reply

Mapped audio rate bus in OSC message refplied for g_queryTree message
was referring to control rate bus, fixed this.
Fix: Panning was reversed on LinXFade2, simd only.
Fixed: When no splits are present, editor window alpha is not updated on document switch. Now, we switch active appearance every time the editor is swapped out, not just when it's newly created.
Match plot view colors to palette.
Merge pull request #1103 from 8c6794b6/queryTree_audio_bus_map

server: mapped audio bus for /g_queryTree.reply
help: add information about convolution frame sizes. This fixes #1020
help: note that store() takes a path and not a file