Merge julia plugin to main dev branch

PCIe plugin

this should work as very simple filter for one channel. The global var is shared between channels atm so it behaves weirdly on multi-chaannel data

very early alpha  -  this still has a lot of hardcoded paths etc.!

Minor fixes

Added implementation of ExampleEditor destructor (so ExampleProcessor plugin will load if compiled).  Removed OS X settings from ExampleProcessor Makefile.

ChannelSelector improvements.

* Updated images for collapse/show button;
* Updated animations;
* Some other small UI improvements;
* Added possibility to collapse element by clicking "ESC" key
  either on the component itself or on the TextEditor.

* Created SlicerChannelSelectorComponent class which holds inside
  all ChannelSelector's parser related components and which
  takes responsibility for parsing selected range, etc.
* Added possibility to collapse parser related components.
* Added animations.
* UI improvements.
* Minor bugs fixes.

followed instructions by Christopher Stawarz in
https://open-ephys.atlassian.net/wiki/display/OEW/Plugin+build+files