MB 1: Mullvad Browser branding

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