[FEAT] Implemented 'if' support

[BUG] Variables inside blocks couldn't shadow those outside
[FEAT] Decompiler shows address of each opcode

decompiled.txt

@@ -1,10 +1,20 @@
-NOP
-NOP
-PUSH 4
-LD 72
-LD 60
-MUL
-SUB
-ST 144
-STL 4
-STL 0
+0000: NOP
+0001: NOP
+0002: PUSH 4
+0007: LD 72
+0012: LD 60
+0017: MUL
+0018: SUB
+0019: ST 144
+0024: RET
+0025: STL 4
+0030: STL 0
+0035: LDL 8
+0040: PUSH 0
+0045: GT
+0046: JNT 66
+0051: PUSH 1
+0056: STL 12
+0061: JMP 76
+0066: PUSH 2
+0071: STL 16