First version of seven segments display gate
Icon, and now it is parametrizable
Seven Segments Display is now parametrizable.
Merge remote-tracking branch 'origin/VS-35' into VS-35

Conflicts:
	circuit.json
	src/main/java/cl/almejo/vsim/gates/Gate.java
	src/main/java/cl/almejo/vsim/gates/GateDescriptor.java
	src/main/java/cl/almejo/vsim/gates/GateFactory.java
	src/main/java/cl/almejo/vsim/gates/SevenSegmentsDisplayDescriptor.java
	src/main/java/cl/almejo/vsim/gui/SimWindow.java