Make the codeEditor documentation modal dialog be a drawer

[finger563]

Also apply to tree browser.

apply styling such as found here:

http://www.designcouch.com/home/why/2014/04/23/pure-css-drawer-menu/

https://tympanus.net/codrops/2014/09/16/off-canvas-menu-effects/

https://codepen.io/designcouch/pen/sCtAp

[finger563]

Not terribly fun to incorporate materialize into webgme but it can be done - should evaluate making the draw contain everything (including the tree and options)