Some, but not all, use of nocopy labels (etc.) in control.c
Handle resizing of msgbox, and related fixes
Fix freeing error in load_selector widget
Leaner GUI code for the raidbox in control.c

Only build one raidbox, and change just what needs to be changed, instead of
 having a separate raidbox allocated for each and every target.
Refactor mainsize handling (fixes some too-small bounding boxes)
Rework {load,save}_game screens to use nocopy labels
Use nocopy labels in run_raid.c
Build raid_results table slightly more cleanly
Use atg_ebox_empty in intel_bombers.c
Use atg_ebox_empty in intel_{fighters,targets}.c