Use native dialog box for credentials
Dynamically link to CredUI.dll for the application to run in both Windows XP and Windows Vista+.
Merge pull request #130 from ioannis-e/credentials

Use native dialog box for credentials
MainFrame: fix window style misdetection

WS_OVERLAPPED is 0, detect it the roundabout way.
MainFrame: make functor operator() const
FileAssoc: resolve possible deadlock

Moral: think twice before blocking an STA thread.
MainFrame: restore window before auto-zoom

Fixes #4360
Don't show stereo icon for flash media

It doesn't indicate anything actually.
Don't use flash window size as video size

It doesn't make sense and causes problems.

Fixes #4361
Increase default flash video size
Sync the resource files after merging pull request #130.

Also remove now unused resources I didn't think about when reviewing.
CoordGeom: Improve const correctness.

Also mark constant as float when it makes sense.
Subpic interfaces: Improve the const correctness.

The ABI isn't modified but the interfaces are for internal use anyway.
SubPicImpl: Minor cosmetics.
DX7 Subpic: Avoid resetting the static subpicture when possible.

Also use safer locking.
DX9 Subpic: Avoid resetting the static subpic and the subpic pool when possible.

Also use safer locking.
DX9 Subpic: Remove unused code.
Memory subpic: Mark some global variables static and minor cosmetics.
SubPicAllocators: Const correctness and minor cosmetics.
Subpic queues: Cosmetics.

Be less aggressive when invalidating the queue without threading while at it.
SubPic provider: Minor cosmetics.