removed trailing spaces and tabs from source and text

This commit ignores the “contrib” folder in order to prevent merge conflicts in dependencies, should these be updated via git.

code/PostProcessing/FindInstancesProcess.cpp

@@ -137,7 +137,7 @@ void FindInstancesProcess::Execute( aiScene* pScene)
             aiMesh* inst = pScene->mMeshes[i];
             hashes[i] = GetMeshHash(inst);
 
-            // Find an appropriate epsilon 
+            // Find an appropriate epsilon
             // to compare position differences against
             float epsilon = ComputePositionEpsilon(inst);
             epsilon *= epsilon;