Moves all HUD screen object icon files from various scattered locations
to icons/hud. No changes made to any icon_states in this PR, no
player-facing changes. Part of larger icon organization work and in
preparation for action button rework.
Added various events to the dcs system in regards to click handling.
Refactored various mouse related procs.
Fixed MUI mask.
Fixed AI jump on double click.
Fixed some runtimes with the click handler system.
Updated the click handler system.
Fixed fireman carry.
Batrachophreno