Removes compiler warnings

- mId was unused
- predeclared classes are structs, which could lead to linking errors under the Microsoft C++ ABI

Signed-off-by: schroedtert <t.schroedter@fz-juelich.de>

include/moCapController.h

@@ -28,7 +28,7 @@
 #include "extrCalibration.h"
 #include "moCapPersonMetadata.h"
 
-class SkeletonLine;
+struct SkeletonLine;
 class QDomElement;
 
 struct SegmentRenderData
@@ -43,7 +43,7 @@ public:
 bool operator==(const SegmentRenderData& lhs, const SegmentRenderData& rhs);
 
 /**
- * @brief The MoCapController class controlls the visualisation of MoCap data.
+ * @brief The MoCapController class controls the visualisation of MoCap data.
  *
  * This class coordinates the visualization of motion capturing data. It saves the
  * different parameters of the visualization and transforms the data in MoCapStorage

include/moCapItem.h

@@ -25,7 +25,7 @@
 class MoCapController;
 class Animation;
 class Petrack;
-class SegmentRenderData;
+struct SegmentRenderData;
 
 /**
  * @brief The MoCapItem class draws stick figures to visalize the MoCap data.

include/moCapPerson.h

@@ -59,7 +59,6 @@ public:
     void setXml(QDomElement &elem) const;
 
 private:
-    int mId;
     std::vector<SkeletonTree> mSkeletons;
     MoCapPersonMetadata mMetadata;
 };