Delay-press to start application

[mottosso]

Goal

Avoid accidental launch.

Motivation

At the moment, an application is launched by pressing the name. If you double-click, you'll launch two applications. Since some applications take a minute to appear running, one may accidentally click many times and cause many applications to launch all at once.

Implementation

Implement a press-and-hold type mechanism, such that you press-and-hold on your application for a second or so in order to launch it, along with some visual indicator of how long you need to press and whether you've pressed long enough.

[BigRoy]

This might be less prone to accidentally happen with this PR: https://github.com/getavalon/launcher/pull/27

It's because the Applications slide into into position briefly before being exactly there. See:

Would that also fix it?