This MR supercedes !1895 as a solution to bug [#50771](https://bugs.winehq.org/show_bug.cgi?id=50771). Rather than fixing the problem of Wine's inability to modify the attributes of read-only files, this patch set instead implements `FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE` which the Msys2 and Cygwin runtime libriries can use to avoid needing to modify attributes.
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v3: ntdll: Implemented FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE
ntdll/tests: Added tests for FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE
ntdll: Initial implementation of FileDispositionInformationEx
include: Defined FILE_DISPOSITION_INFORMATION_EX and friends
https://gitlab.winehq.org/wine/wine/-/merge_requests/3073
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v2: winegstreamer: Lookup stream handler result using a dedicated helper.
winegstreamer: Rename winegstreamer_stream_handler to stream_handler.
winegstreamer: Create and destroy result entries using dedicated helpers.
winegstreamer: Lookup stream descriptors before starting streams.
winegstreamer: Keep a reference on the media source start descriptor.
https://gitlab.winehq.org/wine/wine/-/merge_requests/3100
Required for !1857 to not break when comctl32 version 6 isn't requested by application (in particular, found this in [qapitrace](https://github.com/apitrace/apitrace)).
Manifest resource id and assembly identity name match with Windows.
For isolation purposes, activation context is disabled while emitting events.
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v7: comdlg32: Enable visual styles when showing IFileDialog.
comdlg32: Return E_UNEXPECTED if IFileDialog is already shown
https://gitlab.winehq.org/wine/wine/-/merge_requests/2068
Required for !1857 to not break when comctl32 version 6 isn't requested by application (in particular, found this in [qapitrace](https://github.com/apitrace/apitrace)).
Manifest resource id and assembly identity name match with Windows.
For isolation purposes, activation context is disabled while emitting events.
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v6: comdlg32: Enable visual styles when showing IFileDialog.
https://gitlab.winehq.org/wine/wine/-/merge_requests/2068
Required for !1857 to not break when comctl32 version 6 isn't requested by application (in particular, found this in [qapitrace](https://github.com/apitrace/apitrace)).
Manifest resource id and assembly identity name match with Windows.
For isolation purposes, activation context is disabled while emitting events.
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v5: comdlg32: Enable visual styles when showing IFileDialog.
https://gitlab.winehq.org/wine/wine/-/merge_requests/2068