Improve Windows integration

[mwestphal]

In order to extend windows explorer:

• [X] Thumbnails
• [ ] Add opening folder support from context menu
• [ ] Property tab (number of points/cells and dataset type)
• [ ] Allow multi-files opening from explorer (currently open several instances): https://github.com/f3d-app/f3d/issues/497
• [ ] Integrate as a quicklook viewer: https://github.com/f3d-app/f3d/issues/900
• [ ] Improve thumbnails: #797
• [x] Add dark title bar support: https://github.com/f3d-app/f3d/issues/895
• [x] Fix FileAssociation: https://github.com/f3d-app/f3d-superbuild/issues/160
• [ ] Improve Window positioning by default: https://github.com/f3d-app/f3d/issues/1590

References:

• https://docs.microsoft.com/en-us/windows/win32/shell/shell-exts
• https://docs.microsoft.com/en-us/windows/win32/shell/building-thumbnail-providers
• https://github.com/microsoft/Windows-classic-samples/tree/master/Samples/Win7Samples/winui/shell/appshellintegration/RecipeThumbnailProvider

[mwestphal]

@Meakk does this one matter ? I think you mentionned that Allow multi-files opening from explorer should be done ?