Fixed a bug in the decompiler

Hello!

Last release of the decompiler could only detect switches in the following format.

80 00   LSL   R0, R0, #2

02 49   LDR   R1, =off_83C173C
40 18   ADD   R0, R0, R1
00 68   LDR   R0, [R0]
87 46   MOV   PC, R0

I successfully have it reading switches from r1, and will be advancing it to switches with any registers.

I also have to look into getting default case switches to work.

Expect a release soon!