Dialogs, Statusbar and Loader

This version focuses on fixing issues as well as introducing three new features:

Better dialog headers

It has been hard but I finally got able to change Dialogs look and feel to be more like a genuine Material Design IDE. Now, dialogs have a bigger heading, left aligned, with a better padding. Unfortunately (or not), it cannot be customized at the moment, but I'm sure you will love it so you won't be needing to disable it :)

Material Design Loader

Replace the loader when loading large files, with the well known circular loader of Material Design. Of course, since this is not a Javascript IDE, the rendering is a little ugly, but I'm no SVG expert so for now bear with that.

Compact (and Padded) status bar.

Make the status bar a little bigger with a little padding of 10px. And for those who prefer the regular one, I've added the option to do so obviously (like the Sublime plugin).

Lighter theme improvement

Since my focus was to test the limits of the IDE since I've taken the project, I didn't focus a lot on improving current themes aside from the Default and Darker one. This time I've taken the time to inspect the Lighter theme and try to fix all the issues that I could find.
Of course, there is still a lot much to do but it should be significantly better than before.

The release is not yet published to the repository, because I haven't tested it in all IDEs yet. Hopefully there won't be some unexpected issues but if everything goes well, I'll release the new version till the end of the week.

Cheers.