Fix #4312 and Windows on ARM64 support.

Changes for #4312:
* The installed VCS list is cached but has an indirect dependency on the value of the environment's TARGET_ARCH during construction.  For the initial construction, force the env['TARGET_ARCH'] to be undefined and then restore the value after construction.
* Protect against an empty regular expression list when iteratively removing default tool sequences.

Changes for ARM64 host support:
* Add configuration data structures to support ARM64 hosts and ARM64 native tools for VS2022.  Update the tests for the renamed data structures.
* Evaluate the PROCESSOR_ARCHITECTURE value from the windows registry before evaluating the os environment values for host architecture determination on Windows.
* Set VSCMD_SKIP_SENDTELEMETRY=1 for arm32 process on arm64 host if not already defined to prevent powershell dll not found error.
* The os environment variable value for PROCESSOR_ARCHITECTURE is AMD64 for Windows ARM64 hosts when using a python built for AMD64.

Related MSVC changes for #4312 and ARM64 hosts:
* Check that cl.exe exists in find_batch_file for VS6 to VS2015.  Move the sdk batch file query code to its own function.  Query for the sdk batch file only when all of the vc script host/target combinations have been exhausted and a valid script has not been found.
* Hoist the query for the vc product directory outside the current vc script host/target loop.  Catch the internal exceptions as before.
* Clear the sdk batch file path for VCForPython as the sdk batch files do not appear to be updated during installation and do not point to the VCForPython installation location.
* Move the sdk batch file determination to its own function.  Defer evaluation of candidate sdk batch files until after all host/target combinations of the vc scripts have been evaluated.
* Always check that cl.exe is found in vc script environment path.

Miscellaneous:
* Reorder and group exception definitions in Tool\MSCommon\vc.py by external exceptions and internal exceptions.
* Adjust debug messages.
* Convert the floating point msvc version to an integer version number for product range comparisons (e.g., 14.3 is 143).  Adjust the comparison ranges accordingly.

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