wined3d: Explicitly pass the texUnitMap to shader_glsl_load_vsamplers() and shader_glsl_load_psamplers().

The general idea here is to reduce dependencies on the entire stateblock, and
pass the real dependencies explicitly. This should make it clearer what
context a shader really needs.

This allows creating a wineprefix on 64-bit, where exception handling
doesn't quite work yet.

This behaviour was tested against native winhlp32 by pressing down the
left mouse button and holding it while over the link to avoid having
WM_LBUTTONUP sent.  I noticed that the action for clicking the link
happened right away, without waiting for me to release the mouse button.

This is the stuff not yet backed by code in mshtml.

dinput: OS/X joystick: Check usage page to avoid odd non-button elements found on the 360 controller.

twain_32: Revise internal documentation and one test slightly to bring into line with TWAIN 1.8 requirements.

sane.ds: Add support for DG_IMAGE/DAT_IMAGELAYOUT/GET and SET. Enables Acrobat to use custom scan sizes.