ddr: automatically register codecs on launch (#351)

## Link to GitHub Issue, if one exists
#345 

## Description of change
On launch of spice.exe / spice64.exe, call `regsvr32` on known codecs in
the `com` directory.

Add an option to skip this (`-ddrnocodec`) as a chicken bit.

## Testing
Tested 32 and 64 bit DDR.

src/spice2x/games/ddr/ddr.h

@@ -7,6 +7,7 @@ namespace games::ddr {
 
     // settings
     extern bool SDMODE;
+    extern bool NO_CODEC_REGISTRATION;
 
     // Buffers to store RGB data for tape LEDs on gold cabinets
     const size_t TAPELED_DEVICE_COUNT = 11;
@@ -18,5 +19,8 @@ namespace games::ddr {
         virtual void pre_attach() override;
         virtual void attach() override;
         virtual void detach() override;
+
+    private:
+        void register_codecs();
     };
 }