* ParameterSlider: added possibility to change rotary fill colour.
* CAR gain slider: changed rotary fill colour.

* Fixed bug gain slider have some buggy per-channel functionality
  so it were possibility to set different gain values for only some
  channels.
* Now gain slider affects all the channels.
* Explicitly added gain slider to the CAREditor component.

* Added custom audio processor editor for CAR plugin - CAREditor;
* Added buttons to switch between "Reference" and "Affected" channels;
* CAR processor some minor changes;
* Some minor changes in GenericEditor class which provide more
  possibilities for plugins (e.g. plugins can implement their own
  resized() methods, etc.);
* Added UIUtilities header file in which we can include any
  UI components/utilities which will be useful for easier plugin
  creation.

Created Xcode projects for all currently-built plugins.  Added Xcode workspace with "All" scheme for building GUI and all plugins.  Addressed some compiler warnings in plugin code.

added functions getRecordingNumber and getExperimentNumber to CoreServcies. Extended NetworkEvents plugin to send this upon request

added functions to network module to retrieve acquisition/recording status and the current recording path