Make plot color/value formatting generic utilities.

Previous implementations of these functions (in TracyView) are still used
throughout the code. They will be removed in subsequent commits.

server/TracyUtility.hpp

@@ -4,10 +4,13 @@
 #include <stdint.h>
 
 #include "imgui.h"
+#include "TracyEvent.hpp"
 
 namespace tracy
 {
 
+class Worker;
+
 enum class ShortenName : uint8_t
 {
     Never,
@@ -22,6 +25,9 @@ void TooltipNormalizedName( const char* name, const char* normalized );
 
 static inline const char* ShortenZoneName( ShortenName type, const char* name ) { ImVec2 tsz = {}; return ShortenZoneName( type, name, tsz, 0 ); }
 
+uint32_t GetPlotColor( const PlotData& plot, const Worker& worker );
+const char* FormatPlotValue( double val, PlotValueFormatting format );
+
 }
 
 #endif