Add a separate button for unfolding a folder.

Solves the issue that you cannot fold folders when there is only a single button.
UMixer should not show tracks set to not be shown in gui
fixed score rendering with multiple servers in a loadbalancer

When multiple servers are in a load balancer the score wouldn't be correctly rendered in nrt since most events would not be added to the osc bundle
freeAllBuffers fix bug

Nasty bug, iterating while mutating array causes errors. Have to make copy before iterating.
UScore - fixed relase task not taking into account latency.
UChain#prepareAndStart fixed bug - was not releasing with releaseSelf == false
added fade curves for events
Merge remote-tracking branch 'casper/patch-1'