Remove backup files.
All these files are created by a text editor and we don't need them.
Add basic gitignore file
Ignore backup files and OS generated files
Merge branch 'remove-backup'

Conflicts:
	ControlMux/src/ControlMux.cpp~
	HandFollow/src/HandFollow.cpp~
	MotorControl/src/Filter_node.cpp~
	MotorControl/src/MotorControl_node.cpp~