Make OpenSpace work with the new SGCT version

include/openspace/engine/openspaceengine.h

@@ -84,8 +84,8 @@ public:
     void touchDetectionCallback(TouchInput input);
     void touchUpdateCallback(TouchInput input);
     void touchExitCallback(TouchInput input);
-    std::vector<char> encode();
-    void decode(std::vector<char> data);
+    std::vector<std::byte> encode();
+    void decode(std::vector<std::byte> data);
 
     void scheduleLoadSingleAsset(std::string assetPath);
     void toggleShutdownMode();

include/openspace/engine/syncengine.h

@@ -53,13 +53,13 @@ public:
      * Encodes all added Syncables in the injected <code>SyncBuffer</code>.
      * This method is only called on the SGCT master node
      */
-    std::vector<char> encodeSyncables();
+    std::vector<std::byte> encodeSyncables();
 
     /**
      * Decodes the <code>SyncBuffer</code> into the added Syncables.
      * This method is only called on the SGCT slave nodes
      */
-    void decodeSyncables(std::vector<char> data);
+    void decodeSyncables(std::vector<std::byte> data);
 
     /**
      * Invokes the presync method of all added Syncables

include/openspace/engine/windowdelegate.h

@@ -94,11 +94,6 @@ struct WindowDelegate {
 
     void (*setEyeSeparationDistance)(float distance) = [](float) {};
 
-    glm::ivec4 (*viewportPixelCoordinates)() = []() { return glm::ivec4(0, 0, 0, 0); };
-
-    void (*sendMessageToExternalControl)(const std::vector<char>& message) =
-        [](const std::vector<char>&) {};
-
     bool (*isFisheyeRendering)() = []() { return false; };
 
     unsigned int(*takeScreenshot)(bool applyWarping) = [](bool) { return 0u; };

include/openspace/util/syncbuffer.h

@@ -57,14 +57,14 @@ public:
     //void write();
     //void read();
 
-    void setData(std::vector<char> data);
-    std::vector<char> data();
+    void setData(std::vector<std::byte> data);
+    std::vector<std::byte> data();
 
 private:
     size_t _n;
     size_t _encodeOffset = 0;
     size_t _decodeOffset = 0;
-    std::vector<char> _dataStream;
+    std::vector<std::byte> _dataStream;
 };
 
 } // namespace openspace