GUACAMOLE-1866: Add capability for users to configure recent connections

[necouchman]

I took a stab at an implementation of some initial changes to the Recent Connections that allow the user to control 1) whether they show up at all, and 2) how many connections are kept.

As part of the change I modified the title bar across the top a bit - used the Application Name in the upper-left (instead of "Recent Connections") and made it slightly smaller. I'm perfectly happy to take suggestions on alternatives for this - as many well know by this time, UX design is a weak spot for me :-).

[jmuehlner]

@necouchman If you've made visual changes - would you mind posting a screenshot so we can see what things look like now?

[necouchman]

@necouchman If you've made visual changes - would you mind posting a screenshot so we can see what things look like now?

Sure, not a problem. Here is a quick snapshot of the visual changes I alluded to:

Again, I'm happy to take suggestions on this - I just took a stab at something that would allow the "Recent Connections" header to be easily removed.

Here's the preference section...though it should be showing the default value - something to investigate:

[necouchman]

Okay, UI - and code issue - is fixed.

[jmuehlner]

Getting back to this after a few months, and on another read-through it LGTM.