Merge branch 'sev/weapon_panel_retry' into 'master'

Weapon Panel Retry

Based on the discussion at !105, I've made the following changes to @terencehill's implementation:
- The icons are distributed symmetrically, no matter if the panel is arranged vertically or horizontally
- If the bounds touch a screen edge, the panel is snapped to that edge

This merge request replaces !105.

See merge request !106