Add NDS sound support

TODO:
- IMA ADPCM
- Instrument color, icon

src/gui/guiConst.cpp

@@ -179,6 +179,7 @@ const char* insTypes[DIV_INS_MAX+1][3]={
   {"PowerNoise (noise)",ICON_FUR_NOISE,ICON_FUR_INS_POWERNOISE},
   {"PowerNoise (slope)",ICON_FUR_SAW,ICON_FUR_INS_POWERNOISE_SAW},
   {"Dave",ICON_FA_BAR_CHART,ICON_FUR_INS_DAVE},
+  {"NDS",ICON_FA_BAR_CHART,ICON_FUR_INS_DAVE},/* placeholder */
   {NULL,ICON_FA_QUESTION,ICON_FA_QUESTION}
 };
 
@@ -992,6 +993,7 @@ const FurnaceGUIColorDef guiColors[GUI_COLOR_MAX]={
   D(GUI_COLOR_INSTR_POWERNOISE,"",ImVec4(1.0f,1.0f,0.8f,1.0f)),
   D(GUI_COLOR_INSTR_POWERNOISE_SLOPE,"",ImVec4(1.0f,0.6f,0.3f,1.0f)),
   D(GUI_COLOR_INSTR_DAVE,"",ImVec4(0.7f,0.7f,0.8f,1.0f)),
+  D(GUI_COLOR_INSTR_NDS,"",ImVec4(0.7f,0.7f,0.8f,1.0f)),
   D(GUI_COLOR_INSTR_UNKNOWN,"",ImVec4(0.3f,0.3f,0.3f,1.0f)),
 
   D(GUI_COLOR_CHANNEL_BG,"",ImVec4(0.4f,0.6f,0.8f,1.0f)),
@@ -1234,6 +1236,7 @@ const int availableSystems[]={
   DIV_SYSTEM_PONG,
   DIV_SYSTEM_POWERNOISE,
   DIV_SYSTEM_DAVE,
+  DIV_SYSTEM_NDS,
   0 // don't remove this last one!
 };
 
@@ -1325,6 +1328,7 @@ const int chipsSpecial[]={
   DIV_SYSTEM_SM8521,
   DIV_SYSTEM_POWERNOISE,
   DIV_SYSTEM_DAVE,
+  DIV_SYSTEM_NDS,
   0 // don't remove this last one!
 };
 
@@ -1347,6 +1351,7 @@ const int chipsSample[]={
   DIV_SYSTEM_K053260,
   DIV_SYSTEM_C140,
   DIV_SYSTEM_C219,
+  DIV_SYSTEM_NDS,
   0 // don't remove this last one!
 };