Add quotes around the VCPKG_ROOT and Z_POWERSHELL_EXE variable path assignments.

[jcbrill]

Add quotes around the VCPKG_ROOT and Z_POWERSHELL_EXE variable path assignments.

Without adding quotes around the set variable path assignments, paths that contain a close parenthesis character ) would cause the command/batch file to exit prematurely and vs batch call chains (e.g., vcvarsall.bat) to fail.

[jcbrill]

For testing with VS2022:

• vcpkg-init.ps1 was renamed to vcpkg-init.cmd.
• The internal paths were updated to those in the original VS2022 file.
• The signature block from the original VS022 file was added.
• The modified vcpkg-init.cmd file was copied into %VSINSTALLDIR%\vc\vcpkg.

All four assignments were tested locally with:

• VS2022 installed into C:\Program Files (x86)
• Powershell path of C:\Program Files (x86)\WindowsPowerShell\v1.0
• USERPROFILE path of C:\Users (x86)\test
• Running VS2022 vcvarsall.bat works as expected.

Issue description and discussion:
#988 (comment)

[BillyONeal]

Thanks for the well written description of the problem and the fix!