7zip: Refactor context-menu handling

[SorYoshino]

Summary

Refines the 7zip manifest to improve accuracy, reliability of context-menu registration, and clarity of metadata, while aligning the structure with current Scoop best practices.

Related issues or pull requests

• Relates to modern7z: Update description & license, improve installer/uninstaller script logic #7475
• Relates to asar7z: Update description & license, improve install/uninstall script logic Extras#16918

Changes

• Replace simple license string with structured SPDX identifiers and license URL
• Revise notes entry to provide clearer instructions for context-menu registration
• Reworke post_install to:
  • unify handling of .reg templates
  • support both per-user (HKCU) and global (HKLM) contexts via $global
  • replace {{7zip_dir}} placeholder in templates
  • ensure correct escaping and encoding
• Add Start Menu shortcuts grouping under 7-Zip folder
• Add shortcut to 7-zip.chm help file
• Add uninstaller.script to import uninstall-context.reg automatically on uninstall

Notes

; Effective only when configured under the HKEY_CURRENT_USER hive.

[HKEY_CURRENT_USER\Software\7-Zip\Options]
"CascadedMenu"=dword:00000001
"MenuIcons"=dword:00000001

Testing

The test results are as follows:

┏[ ~]
└─> scoop install Unofficial/7zip
Installing '7zip' (25.01) [64bit] from 'Unofficial' bucket
Loading 7z2501-x64.msi from cache.
Checking hash of 7z2501-x64.msi ... ok.
Extracting 7z2501-x64.msi ... done.
Linking D:\Software\Scoop\Local\apps\7zip\current => D:\Software\Scoop\Local\apps\7zip\25.01
Creating shim for '7z'.
Creating shim for '7zG'.
Making D:\Software\Scoop\Local\shims\7zg.exe a GUI binary.
Creating shim for '7zFM'.
Making D:\Software\Scoop\Local\shims\7zfm.exe a GUI binary.
Creating shortcut for 7-Zip\7-Zip File Manager (7zFM.exe)
Creating shortcut for 7-Zip\7-Zip Help (7-zip.chm)
Persisting Codecs
Persisting Formats
Running post_install script...done.
'7zip' (25.01) was installed successfully!
Notes
-----
To register the context menu entry, please execute the following command:
reg import "D:\Software\Scoop\Local\apps\7zip\current\install-context.reg"

• Use conventional PR title: <manifest-name[@version]|chore>: <general summary of the pull request>
• I have read the Contributing Guide

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7zip

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/verify

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7zip

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[z-Fng]

Thanks for your contribution!