mkshim: download ældre versioner

Changes:
#9: Feature Suggestion: Confirm Replace
Added new CLI options
--skip-replace | -skip
Skip replacing the existing shim if it already exists.
--confirm-replace | -confirm
Will prompt for confirmation before replacing the existing shim.

Changes:
#7: Improved environment variable support in target path
#8: Fixed crash when generating a shim for executables with certain icon formats (e.g. qutebrowser)
Added CLI argument alias mapping via an optional mkshim.cli-map file placed next to mkshim.exe
Added warnings for unrecognised CLI switches
Improved --mkshim-noop output: resolved target path is now displayed correctly when env-vars are present

Changes:
#6: Creating a shim with a path that includes an environment variable
Added --keep-envars CLI option

Note
WindowsDefender often marks zip files as infected for no reason. Use VirisTotal reports to ensure the safety of any downloaded distributable:
- mkshim.zip ✅(0/96) VirusTotal latest scan
Changes:
- Added validation of the destination dir write and source read permissions
- Added comprehensive validation of the input params
- Implemented --relative | -r
- Implemented --no-console | -nc

Note
WindowsDefender often marks zip files as infected for no reason. Use VirisTotal reports to ensure the safety of any downloaded distributable:
- mkshim.zip ✅(0/96) VirusTotal latest scan
Changes:
- Added support for `--elevate` to build shims that require elevation

Note
WindowsDefender often marks zip files as infected for no reason. Use VirisTotal reports to ensure the safety of any downloaded distributable:
- mkshim.zip ✅(0/96) VirusTotal latest scan
Changes:
- Change: overlay is ALWAYS applied unless --no-overlay is specified
- Updated app icon overlays