Add condition instructions

[levBagryansky]

We should add condition instructions to our ISA

[levBagryansky]

@c71n93
I think the following instructions are necessary here.
All branches are relative.

byte 0	byte 1	byte 2	byte 3	Description
if_icmpeq	r1	branchbyte1	branchbyte 2	(long operation) if acc == r1 then branch otherwise just next instr
if_icmpne	r1	branchbyte1	branchbyte 2	(long operation) if acc != r1 then branch
if_icmpgt	r1	branchbyte1	branchbyte 2	(long operation) if acc > r1 then branch
if_icmpge	r1	branchbyte1	branchbyte 2	(long operation) if acc >= r1 then branch
if_icmplt	r1	branchbyte1	branchbyte 2	(long operation) if acc < r1 then branch
if_icmple	r1	branchbyte1	branchbyte 2	(long operation) if acc <= r1 then branch
if_acmpeq	r1	branchbyte1	branchbyte 2	(object ref. operation) if acc == r1 then branch
if_acmpne	r1	branchbyte1	branchbyte 2	(object ref. operation) if acc == r1 then branch
dcmpg	r1			compare floats acc with r1. Acc became 1 if greater than r1, 0 if equal, otherwise -1
dcmpl	r1			compare floats acc with r1. Acc became 1 if less than r1, 0 if equal, otherwise -1
goto		imm1	imm2	relative jump by ( (imm1 << 8) | imm2) bytes

We can later add other operations including operations with immidiate.

[c71n93]

@levBagryansky LGTM

[0pdd]

@levBagryansky 3 puzzles #52, #53, #54 are still not solved.

[0pdd]

@levBagryansky 4 puzzles #52, #53, #82, #83 are still not solved; solved: #54.