endless-eula: change the page title

To match new designs.

[endlessm/eos-shell#3601]
endless-eula: show terms and conditions inline

We use an EvView from the Evince library for this purpose.

[endlessm/eos-shell#3601]
endless-eula: handle external links from terms and conditions

Handle the two links we care about inline by presenting a modal dialog.

[endlessm/eos-shell#3601]
Merge pull request #70 from endlessm/shell/3601

Shell/3601