Add Bubble System Support

Bubble System 2 channel Wavetable sound generator logic is configuration with K005289, 4 bit PROM and DAC.
K005289 controls pitch and 5 bit address generator per channel, Waveform select and Volume control is tied to AY-3-8910 ports. (each port for per channels)
these configuration is better known as K005289, the part of logic.
furnace emulates this configurations as single system, waveform format is 15 level and 32 width.

src/engine/playback.cpp

@@ -309,6 +309,15 @@ bool DivEngine::perSystemEffect(int ch, unsigned char effect, unsigned char effe
           return false;
       }
       break;
+    case DIV_SYSTEM_K005289:
+      switch (effect) {
+        case 0x10: // select waveform
+          dispatchCmd(DivCommand(DIV_CMD_WAVE,ch,effectVal));
+          break;
+        default:
+          return false;
+      }
+      break;
     default:
       return false;
   }