- Refined state handling for TBlockInfo

- Added caching of normals into TBlockInfo
- Added differentiation for low and high res materials to TBlockInfo
- Removed draw list clearing from FillDrawList
- Changed TScreenBuffer.Store to return a reference to the stored TBlockInfo
- Added missing ; to GetSerial
- More cleanups in ULandscape.pas
- Moved several local variables of TfrmMain.Render into TfrmMain members
- Moved several size related variable initializations from Render into OnResize
- Extracted GetDrawOffset
- Added seperate RebuildScreenBuffer

Client/UfrmMain.lfm

@@ -971,6 +971,7 @@ object frmMain: TfrmMain
       OnMouseUp = oglGameWindowMouseUp
       OnMouseWheel = oglGameWindowMouseWheel
       OnPaint = oglGameWindowPaint
+      OnResize = oglGameWindowResize
     end
     object pnlChatHeader: TPanel
       Left = 0