Added Upgradable Switches - #331

Switches can now be upgraded by inserting a CPU or Ram. These have the following effects:

Ram: Message Queue size gets increased by 5 per tier (T1 => 25, T1.5 => 30 etc) effectively allowing up to 50 messages instead of 20  
CPU: Message delay gets reduced by one tick per tier allowing to reduce from 5 to 2.

Do not close the issue please (or reopen if autoclosed) since i am still going to improve the GUI
I'm curious, have you tried it with a delay of zero? Because I couldn't say off the top of my head whether the implementation would properly handle that right now. We might have to change that to `max blah*3 max 1`.