Add the ability to configure the Console key through the openspace.cfg (closes #2573)

include/openspace/rendering/luaconsole.h

@@ -58,6 +58,8 @@ public:
     void render();
     float currentHeight() const;
 
+    void setCommandInputButton(Key key);
+
 private:
     void parallelConnectionChanged(const ParallelConnection::Status& status);
 
@@ -71,6 +73,8 @@ private:
     properties::Vec4Property _historyTextColor;
     properties::IntProperty _historyLength;
 
+    Key _commandInputButton = Key::GraveAccent;
+
     size_t _inputPosition = 0;
     std::vector<std::string> _commandsHistory;
     size_t _activeCommand = 0;