Pull request for Issue 839 - Removing unused UI files

Got rid of a bunch of ui files which had no usages. Also removed AMGenericLinuxJoystick, which people said was a feature which was not planned to be used.
Removed files include:
- SGMXASScanConfigurationViewer.ui
- AMScanConfigurationView.ui (note this is not related to the proper
AMScanConfigurationView class)
- AMSamplePositionViewActionsWidget.ui
- AMJoystickTestView.ui
- AMJoystickTestView
- AMGenericLinuxJoystick