Emulator player - Added separate Emulation player for playing games from the Arcade.

[fuglaro]

• Menu launched via URL: .../play.html
• Monkey patches the menu.py to work in emulation.
• Specific games launched via URL: .../play.html?game=TinyBlocks
• Supports mobile and desktop browsers.
• Doesn't support rotation (avoiding screen layout complexity).
• For Flucht, you can use a phone and turn it sideways.
• Avoids localStorage conflicts with main site for ease of hosting.
• Only plays games from the Arcade.
• Allows people to share links to the game being emulated.
• I wanted to be able to share links to an emulated Umby&Glow.
• Gives an advertisement link to buy a Thumby.
• Games and menu auto-starts.
• Emulator starts muted.
• Does not support save games.
• Is unfortunately another place to have to update version=? urls.
• This can currently be tested here: https://fuglaro.github.io/TinyCircuits-Thumby-Code-Editor/play.html

[ghost]

Also works well! I'll update the website after I make some changes to the changelog.