Set version to 12.0.1

Update README for Halide 12 release. (halide#6034)

Set version number to 11.0.1

Bump timestamp on branch to appease GitHub

Update images used in apps/ tests (halide#5538)

Some of them weren't the same as the Make equivalents, which meant that the test diverged between the two build systems (sometimes causing failures due to too-large images).

(cherry picked from commit 382c807)

Set Halide version to 10.0.0

Merge pull request halide#4174 from halide/srj-tidy

Remove unused 'using' decls to appease clang-tidy

Merge pull request halide#4174 from halide/srj-tidy

Remove unused 'using' decls to appease clang-tidy

Merge pull request halide#4174 from halide/srj-tidy

Remove unused 'using' decls to appease clang-tidy

Merge pull request halide#2750 from halide/srj-llvm

Fix API change for trunk LLVM