Implement ADS reloads

Bypass engine reload and force weapon into reload state

Universal Animation Scripts/ads_reloads.script

@@ -0,0 +1,32 @@
+function is_valid_wpn(wpn)
+    local section = wpn:section()
+    local has_tristate_reload = ini_sys:r_string_ex(section,"tri_state_reload")
+    if has_tristate_reload then
+        if animation_common.has_animation(section, "anm_open_aim") then
+            return true
+        else
+            return false
+        end
+    else
+        if animation_common.has_animation(section, "anm_reload_aim") then
+            return true
+        else
+            return false
+        end
+    end
+end
+
+function on_before_key_press(key, bind, dis, flags)
+    if bind ~= key_bindings.kWPN_RELOAD then return end
+    local wpn = db.actor:item_in_slot(db.actor:active_slot())
+    if not wpn then return end
+    if not is_valid_wpn(wpn) then return end
+
+    wpn:switch_state(7)
+    flags.ret_value = false
+end
+
+function on_game_start()
+    if magazines then return end
+    RegisterScriptCallback("on_before_key_press", on_before_key_press)
+end