wined3d: Add a depthstencil flag to the formats table and make use of it in CheckDepthStencilCapability.

notepad: Remove the License and NO WARRANTY options from the Help->Information popup menu as the same information can now be viewed from the About dialog.

Remove the Help->Information popup menu and rename the "About Wine"
option to "About Notepad".

For each pixel format we store a flag in the table whether it supports
post pixelshader blending. Before applying blending or during a
context switch we verify that blending is turned off for the
format. In case of R32F this gave a 5-6x performance boost (without
filtering and software conversion).