- [FIX] ui module should only update renderer when it actually changes

- [NEW] Disassembly window now can scroll with cursors or mouse wheel
- [NEW] Added valgrind script and supporting file

z80.cpp

@@ -1066,6 +1066,7 @@ namespace z80
 
     uint32_t step()
     {
+        z80debug::setcursor(rPC);
         current_opcode_address = rPC;
         t = 0;
         const uint8_t opcode = READ_M1();