MB 1: Mullvad Browser branding

See also:
#5: Product name and directory customization
#12: Create new branding directories and integrate Mullvad icons+branding
#14: Remove Default Built-in bookmarks
#35: Add custom PDF icons for Windows builds
#48: Replace Mozilla copyright and legal trademarks in mullvadbrowser.exe metadata
#51: Update trademark string
#104: Update shipped dll metadata copyright/licensing info
#107: Add alpha and nightly icons