Add medic anim function with proper interrupt

Closes #1386

Vanilla commits
applied:
f99a3deced
731b957e8e

Removed
two unused files and a few variables made redundant by actionInProgress

SQF/dayz_code/actions/object_build.sqf

@@ -105,6 +105,4 @@ if (_build) then {
         };
     } foreach _items;
     format[localize "str_build_failed_02",_text] call dayz_rollingMessages;
-};
-
-dayz_actionInProgress = false;
+};