Add new branch instructions and change opcode

On request of issue #29, the branch instuctions are moved to opcodes 0x70-0x7F.
On request of issue #32, is added IF Great branch isntructions do ">" and ">=" comparations
Fixed opcodes fro branch instructions and updated cheatsheet

Also, updated the CPU version. Branch instructions are opcodes of range 0x70-0x7F
Merge pull request #34 from trillek-team/branch_instructions

Tweaked Branch instructions