* Fixed some problems with build due to the symbol redefinitions (It's
  still need to be reviewed and we need to find a better way for doing
  this);
* Added plugin properties in the configuration and adding the
  possibility to change it on the fly (still WIP);
* Added visual component to select the appropriate tab in the plugin
  configuration;
* Some cleanup;

* All modules are replaced with the JUCE 4.2.1 ones;
* Introjucer was replaced by Projucer;
* Also some appropriate needed fixes for Makefile.plugins;
* Removed -fvisibility=hidden flag for Linux building.