suggestion: fixed icons order (Toddler mode + allow tab switch)

[shula]

Please add option to lock single/all icons' position (for each tab).

This feature is already implemented in toddler mode.

Rationale: Icons tend to change place too easily / accidentally. especially under extreme conditions (wet / dry / pocket / gloves / broken / bugs)

But when icons are fixed, we take advantage of "finger memory", avoid mistakes between similar icons, and more.