Release v1.15.0.0

This is a major fixes/improvements release

• Localization: preserve msi platform settings when settings language with SetPackageLanguages (fixes #939)
• Added LaunchApplicationAction.
• NSIS bootstrapper-spash
  • Switched to the stock AdvSplash plugin
  • Added support to FadeIn, FadeOut, KeyColor parameters https://nsis.sourceforge.io/Docs/AdvSplash/advsplash.txt
• Forced to use a single "Uninstall/Change" button in the ARP
• Remove duplicated deferred properties.
• Allows the installer to display full UI for the "Uninstall" button in the Control Panel.
• Typo fix ResilientPackageIstallDir -> ResilientPackageInstallDir
• DigitalSignature support has been added to the NsisBootstrapper
• Issue #906: Error in Compiler.BuildMsi when building using cscs.exe but not from Visual Studio