Maintenance: Add mandatory field offset markers /* XXXX */ and assertions to Render headers (DX7, DX9, Primitives, Text, Textures)
Batch #1060 by ragnarok-clanker: no function's compiled code changes; checked with 188 compiled unit(s), including every includer of Source/Render/DX7/DeviceOwnerDX7.h, Source/Render/DX7/DirectDrawEnumeration.h, Source/Render/DX7/RenderSystemDX7.h, Source/Render/DX7/RendererFogDX7.h, Source/Render/DX7/SurfaceDX7.h, Source/Render/DX9/DeviceOwnerDX9.h, Source/Render/DX9/DeviceStateDX9.h, Source/Render/DX9/RendererFogDX9.h, Source/Render/DeviceContext/DCSurface.h, Source/Render/DisplayMode.h, Source/Render/Primitives/LightmappedPrimitive.h, Source/Render/Primitives/RenderCommandPool.h, Source/Render/Primitives/RenderPrimitive.h, Source/Render/Primitives/RenderPrimitivePool.h, Source/Render/Primitives/RenderQueues.h, Source/Render/Primitives/RenderVertexPool.h, Source/Render/Projection/RendererViewport.h, Source/Render/RenderAdapter.h, Source/Render/Renderer.h, Source/Render/RendererBackBuffer.h, Source/Render/Text/TextContext.h, Source/Render/Textures/BitmapTextureCache.h, Source/Render/Textures/SpriteAtlas.h, Source/Render/Textures/Surface.h.