video_out: HDR support (#2381)

* Initial HDR support

* fix for crashes when debug tools used

src/common/config.h

@@ -51,6 +51,7 @@ void SetUseUnifiedInputConfig(bool use);
 u32 getScreenWidth();
 u32 getScreenHeight();
 s32 getGpuId();
+bool allowHDR();
 
 bool debugDump();
 bool collectShadersForDebug();