Support for numerous chips and UI Improvements

Support has been added for numerous chips. Chips with bootloader bits in extFuse and chips without bootloader functionality are now supported.

The fuse input page now shows the currently connected chip and the name of the selected fuse bit.

Target PCB Revision 1

Target ISP board was added. It is tested and works as excpected.

(Main PCB is unchanged except for some text cleanup)

Main PCB Revision 2

R1, R2 have been fixed. They are now pull-ups instead of pull-downs for I2C.
The PCB should function the same but be more stable.

However, be warned, that I've never actually ordered this PCB.

Main PCB Revision 1

This version of the PCB is faulty. R1 and R2 should be Pull-Ups instead of Pull-Downs.

I've ordered this version of the PCB and assembled it. It worked fine for me when leaving R1, R2 out.
I'd still recommend getting Revision 2 though.