Allow the camera to be moved with the mouse

[rcjsuen]

https://github.com/ashugeo/magic-maze/blob/96f1fabb99995ca773cf336eae3e5acdedf03c7a/src/client/play/js/config.js#L7

I see there is a cameraMouse configuration value but setting it to true doesn't seem to do anything (besides adding errors to the browser's console).

Some ideas for moving the camera with the move:

• primary click and hold then move the mouse to pan
• secondary click and hold then move the mouse to pan
• press down on a key (such as shift or whatever) and then move the mouse to pan

[hugosaintemarie]

Yeah, cameraMouse must be deprecated. The way I implemented it at the time was to have the screen pan to whatever direction when your mouse was approaching a border (as in many games with maps).