Update workflow, script, and submodules

[L1ghtmann]

• Updates libplist
• Updates ldid
• Adjusts libtapi build to slim archs and targets built
• Adds libplist's plistutil to toolchain
• Simplifies parts of workflow and script
• Switches to utilizing docker for builds
• Adds aarch64 builds
• Adds native Arch and UBI builds

Would've also updated cctools-port and apple-libtapi, but they seem to have issues building.

Tested semi-successfully here. Unsure how to go about resolving the Arch-aarch64 and UBI-aarch64 builds failing due to time constraints...open to changes there.

[L1ghtmann]

Recent updates include:

• Switching to docker for the builds
• Support for Arch and UBI native builds
• AArch64 build support
• Updates to workflow to use artifacts for incremental builds and a release for the complete final build
• Updates libplist submodule

Unfortunately, the workflow is only semi-successful due to very slow Arch-aarch64 and UBI-aarch64 builds. Open to suggestions as to how to remedy that.