[WIP] upgrade to wgpu26

[Vipitis]

as usual, still in progress...

this is branched ontop of #740 and with the other few open PRs will likely require some rebasing.
We don't have a wgpu-native release yet, but there is a branch that updates wgpu-core to v26 which I compiled locally and started this work: gfx-rs/wgpu-native#509
I should note that webgpu.h is very much out of sync and will likely require a lot more changes, there is also a PR for that: gfx-rs/wgpu-native#511

Some working changes:

• DXC no longer requires dxil.dll, so the script in Add examples for instance extras #728 can be simplified (still no debug symbols :/)
• Polygon Mode Polygon mode support #693

todos:

• working examples
• passing tests
• wait for wgpu-native release https://github.com/gfx-rs/wgpu-native/releases/tag/v27.0.2.0
• use the issue template for this PR text, add links diffs
• fix panic "Cannot remove a vacant resource" in the buffer destroy mem test, perhaps related to this change: https://github.com/gfx-rs/wgpu/blob/ee0719f2d84d99ad1a878c42afe8572dfc98276a/CHANGELOG.md?plain=1#L209
• check if depthSlice now works
• device.destroy() and query_set.destroy() might work now
• new instance extras regarding memory limits
• retest fatal errors and device lost errors