General changes

• Add the ability to change the executable for package managers (thanks to @mrixner)
• Improvements to the installer and install experience from chocolatey
• More improvements to screenshot database fetching
• Improvements to installer extension detection (for when downloading installers)
• More improvements to UniGetUI Elevator
• Improvements to launch procedure
• Allow PowerShell7 to clear older versions of modules when updating
• Scoop may use PowerShell7 when available

UniGetUI.Installer.exe SHA256: 8F59878A50E97E7D1E3F72CFB3D9B27678A3BAB32CCFE44A2FF6E81B3697210A
UniGetUI.x64.zip SHA256: E50E5F94CF66D6ED2AD5847006DA65ABCF3FDBC3D387527CA6C3AC3A710A4B92