aambundle: should be easier to override the web CSS

[hlship]

I don't like how narrow the play window is (it defaults to 60ch); dgt keeps its own copy of webfrontend.css with that changed to 200ch.

It would be nice if there was a way to provide a customization of webfrontend.css, perhaps in the form of an extra css file injected before or after the default, to provide overrides.

[dstelzer]

Something like a command-line option to copy a certain file into the output (overwriting what's already there)?