clang: constructor initialization order

while not a major issue per-se, the sheer number of times the engine has to jump back in memory and backfill data in a given class can add up. First run of... many.,

Engine/source/T3D/fx/groundCover.cpp

@@ -60,14 +60,14 @@ GFXImplementVertexFormat( GCVertex )
 };
 
 GroundCoverShaderConstHandles::GroundCoverShaderConstHandles()
- : mTypeRectsSC( NULL ),
+ : mGroundCover( NULL ),
+   mTypeRectsSC( NULL ),
    mFadeSC( NULL ),
    mWindDirSC( NULL ),
    mGustInfoSC( NULL ),
    mTurbInfoSC( NULL ),
    mCamRightSC( NULL ),
-   mCamUpSC( NULL ),
-   mGroundCover( NULL )
+   mCamUpSC( NULL )
 {
 }