CPU Usage Indicator

CPU Usage Indicator in the status bar, just like the Memory Indicator.
Also contains actions for performance problems diagnostics.
- left click on the panel generates a thread dump (useful when the IDE is doing something on the background and you want to know what).
- configuration GUI for Performance Watcher (IDE's bundled automatic thread dumper for frozen UI). You can configure it to dump even for shorter freezes than is the default: 5 second.
Note:
-it is painted in a background thread, not EDT, so it will update even when the GUI is stuck
-getting the process usage is a very expensive operation :(