Add OpenCL trace support

- Adds the file TracyOpenCL.hpp which contains the API to annotate OpenCL applications
- It works in a similar fashion to the Vulkan annotations
- Adds an example OpenCL application in examples/OpenCLVectorAdd
- Adds "OpenCL Context" to the UI
- Manual entry for annotating OpenCL zones

common/TracyQueue.hpp

@@ -263,7 +263,8 @@ enum class GpuContextType : uint8_t
 {
     Invalid,
     OpenGl,
-    Vulkan
+    Vulkan,
+    OpenCL
 };
 
 struct QueueGpuNewContext