Added support for downloading the Game & Watch ROMs

[hallem]

GlobalHelper:

• made the ArchiveFiles property populate on first use.
• added GameAndWatchArchiveFiles

Archive:

• changed files to be a List<> vs an array so items could be easily removed
• updated some variable names to camel casing

Config:

• added new config setting to set the archive name for game and watch

Program:

• awaited the Global Helper Initialize as it wasn't done populating when testing updating the game and watch core
• removed commented out code

Core:

• moved ad hoc string concats to string interpolation
• removed unused method ReadPlatformFile
• made Download Asset more generic so it can support downloading the ROMs for Game & Watch
• added code to download the Game & Watch ROMs from ArchiveOrg
• made Check CRC more generic so it can support Game & Watch
• replaced "" with string.Empty
• collapsed Build Asset Url code into Download Asset to make it easier to be more generic