Add BC7/BC5 thumbnails, installer, and CI#1
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Decoding - Add self-contained BC7 (full 8-mode) and BC5 (normal-map) software decoders to s3tc.cpp; BC7 tables/flow match the BC7 spec. Wire both into TexThumbnailProvider.cpp (tex_format 0x0D / 0x0E). Priority over Photoshop - DllRegisterServer now also registers the handler CLSID under the current .tex ProgID and SystemFileAssociations\.tex in HKCU, which overrides the HKLM handler Photoshop registers. Only the thumbnail subkey is touched. DllUnregisterServer tears these down too. Distribution - scripts/install-thumbnail-handler.ps1 + uninstall script: one-liner `iwr ... | iex` install that pulls the DLL from the latest Release and registers it per-user (no admin). - scripts/install-local.ps1: build + install a local DLL for testing. - .github/workflows/build.yml: build every push/PR, upload DLL artifact. - .github/workflows/release.yml: on `v*` tag, build and attach the DLL (+ sha256) to the GitHub Release. Cleanup - Rewrite README for this project; remove the obsolete VS2008 .vcproj.
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Decoding
Priority over Photoshop
Distribution
iwr ... | iexinstall that pulls the DLL from the latest Release and registers it per-user (no admin).v*tag, build and attach the DLL (+ sha256) to the GitHub Release.Cleanup