Add Windows installer building and 64-bit builds to AppVeyor

This is Kart-adapted from the following vanilla merge requests:

• https://git.magicalgirl.moe/STJr/SRB2/merge_requests/440 - MinGW64:Target nocona for 64-bit builds [revision]
• https://git.magicalgirl.moe/STJr/SRB2/merge_requests/442 - Add 64-bit job to Appveyor
• https://git.magicalgirl.moe/STJr/SRB2/merge_requests/443 - Add Windows installer building to Appveyor
• Also, CircleCI runs test builds successfully by dummying out ERRORMODE=1 -- see result re-enabled

This allows AppVeyor to succeed with test builds and also create Windows installer packages, both 32-bit and 64-bit. It's a small way to automate the release pipeline.

This specific merge contains links to v1.0.2 assets, which obviously I don't have -- therefore, the installers won't be correct until those assets are available.

See kart-public-appveyor-improvements-test for a working copy that links v1.0.1 assets (with current master code.) Installers from that branch are linked below:

Results

Results and artifacts: https://ci.appveyor.com/project/mazmazz/kart-public/builds/21296978

• 32-bit installers: https://ci.appveyor.com/project/mazmazz/kart-public/builds/21296978/job/l7wj0tap53xk9e40/artifacts
• 64-bit installers: https://ci.appveyor.com/project/mazmazz/kart-public/builds/21296978/job/1i8shb07965e6cck/artifacts

EDIT: MD2 are not in these installers, but that's a trivial issue because those can just be added to the asset archives.

Docs from Vanilla Merge

This adds Windows 7-zip installer and patch building for the 32-bit and 64-bit SDL builds on AppVeyor. Read full documentation here.

Asset WADs, DLLs, and extra files are grabbed from a series of 7-zip archives (see full list here) and then packaged accordingly.

Installer building will only be triggered under these conditions:

• DPL_ENABLED must be set, and
• A branch name containing deployer is pushed, or
• A release tag is pushed and DPL_TAG_ENABLED is set.

Whether or not installers are triggered, the normal test builds will be run. The usual EXE-only artifacts are not affected by this merge.

Parameters to set on the project settings:

• DPL_ENABLED - Must be 1 to enable installer building
• DPL_TAG_ENABLED - If set to 1, will trigger installer building when a release tag is pushed
• ASSET_FILES_OPTIONAL_GET - If set to 1, will download and package music.dta. This is forced to 1 if a release tag is pushed.
• PACKAGE_PATCH_DLL_GET - If set to 1, will include DLLs in the patch build, a la 2.1.21+
• ASSET_CLEAN - If set to 1, will clear the asset archives from the AppVeyor cache so that they can be re-downloaded.

This only implements installer building; FTP and endpoint uploading are not implemented. Instead, you can simply download the artifacts from the AppVeyor jobs.

changed title from Add Windows installer building to AppVeyor and other improvements to Add Windows installer building and 64-bit builds to AppVeyor

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changed target branch from master to next

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• a46ff53c - Use optional asset archive instead of file

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• c70f459b - Use optional asset archive instead of file

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• 18b2f91a - Use optional asset archive instead of file

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added 88 commits

• 18b2f91a...5b4faa4d - 86 commits from branch KartKrew:next
• 8c1b0623 - Flip back ERRORMODE=1 for AppVeyor and CircleCI
• 5047e41e - Merge remote-tracking branch 'kart-public-gl/next' into kart-public-appveyor-improvements

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• 5047e41e...e0f18f6d - 418 commits from branch KartKrew:next
• 20a117cf - Kart Public Next merge

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This AppVeyor branch is ready for current next.

merged

mentioned in commit 94ff7c33