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Use latest Xcode version

Allow any Xcode 12 version

Update latest PyPy version

MRG: Refactor pip install to work round end of pip support

Move pip install commands into their respective platform / Python installs, for clarity.

Use `ensurepip` where possible.

Work around end of pip support for Pythons 2.7 and 3.5.

Deprecate install_pip function as confusing.  Move pip checks into
functions for individual platforms.

MRG: set MACOSX_DEPLOYMENT_TARGET for arm64 build

Co-authored-by: Andrew Murray <3112309+radarhere@users.noreply.github.com>

Co-authored-by: Andrew Murray <3112309+radarhere@users.noreply.github.com>

MRG: Support building arm64 and universal2 wheels on x86_64

Add `arm64` and `universal2` PLAT options.  `universal2` works by seperate Intel and ARM64 builds, and fusing the resulting wheels.

Co-authored-by: Andrew Murray <3112309+radarhere@users.noreply.github.com>

Co-authored-by: Andrew Murray <3112309+radarhere@users.noreply.github.com>

Changed functions to setup instead of wrap

Co-authored-by: Andrew Murray <3112309+radarhere@users.noreply.github.com>