Overlord fixes (#1301)

* srpc: Implement part of VBlank_Handler

And call it on RPC message for lack of better ways

* ssound: Fix distance calculation

avoids negative array index

* srpc: fix sound id assignment

* srpc: bail out on missing sound id

* ssound: Fixes for angle and volume calculation

* srpc: Fix VAG filename stuff

* ssound: Fix CalculateAngle

* ssound: UpdateAutoVol fixes

* srpc: Fix up SET_PARAM command

game/graphics/sceGraphicsInterface.cpp

@@ -2,6 +2,7 @@
 #include "game/graphics/gfx.h"
 #include <cstdio>
 #include "common/util/Assert.h"
+#include "game/overlord/srpc.h"
 
 /*!
  * Wait for rendering to complete.
@@ -28,5 +29,6 @@ u32 sceGsSyncPath(u32 mode, u32 timeout) {
  */
 u32 sceGsSyncV(u32 mode) {
   ASSERT(mode == 0);
+  VBlank_Handler();
   return Gfx::vsync();
 }