Keep Screen On When Installing IPAs

[yur1xpp]

I've always have this annoyance when installing IPAs, especially the large one, I'll have to keep touching the screen to keep it on. The screen display will timeout during installation and the device will lock, effectively making the installation failed in AltStore.

The suggestion is to make AltStore acquire the idle timer as specified in the API until installation is done.

[shanegillio]

Interesting idea, and we'll certainly look into that!