Added generic editor as alternative to screen capturing

Server: Add support for instrument plugins that are effects too (fixes …

…apohl79#139)

Package: cleanup

Major patch

 - Screen capturing rewrite
   o Using FFmpeg
   o OSX screen capturing via avfoundation
   o Windows screen capturing via gdi
   o WEBP image encoding
   o Separate OSX builds for 10.7 and 10.8+ as avfoundation can't hide the cursor before 10.8
 - Upgrade to JUCE 6
 - Logging improvements
 - Separate installers for server and plugin
   o Check for a running server on windows to avoid silently failing updates
   o Allow downgrade and force override on Windows
 - OSX permissions: Check needed permissions at server startup

Installers: Allow downgrade and force override on Windows

Logging: Zero prefix for millis

Configurable plugin folders for the Windows installer

Plugin: fixed race condition

Added VST2 plugin

README: Compat Win 7