Show the cursor as a slot in the surveillance header

The cursor was a line of text under the camera, which read as an
afterthought next to the framed header. It is now a slot button in the
header after the zoom buttons: the item sprite with its count, greyed out
for a ghost, an empty slot for an empty cursor, and the item name in the
tooltip. The window keeps its shape whatever the item is called.

exp_scenario/module/locale/en.cfg

@@ -489,9 +489,9 @@ caption-set-location=Set
 type-player=Player
 type-static=Static
 type-loop=Loop
-caption-cursor=Cursor: __1__ x__2__
-caption-cursor-ghost=Cursor: __1__ (ghost)
-caption-cursor-empty=Cursor: empty
+tooltip-cursor=__1__ x__2__
+tooltip-cursor-ghost=__1__ (ghost)
+tooltip-cursor-empty=Empty cursor
 
 [exp-gui_task-list]
 caption-main=Task List [img=info]

exp_scenario/module/locale/zh-CN.cfg

@@ -474,9 +474,9 @@ caption-set-location=設
 type-player=用戶
 type-static=靜態
 type-loop=循環
-caption-cursor=游標: __1__ x__2__
-caption-cursor-ghost=游標: __1__ (幻影)
-caption-cursor-empty=游標: 空
+tooltip-cursor=__1__ x__2__
+tooltip-cursor-ghost=__1__ (幻影)
+tooltip-cursor-empty=游標為空
 
 [exp-gui_task-list]
 caption-main=工作流程 [img=info]

exp_scenario/module/locale/zh-TW.cfg

@@ -474,9 +474,9 @@ caption-set-location=設
 type-player=用戶
 type-static=靜態
 type-loop=循環
-caption-cursor=游標: __1__ x__2__
-caption-cursor-ghost=游標: __1__ (幻影)
-caption-cursor-empty=游標: 空
+tooltip-cursor=__1__ x__2__
+tooltip-cursor-ghost=__1__ (幻影)
+tooltip-cursor-empty=游標為空
 
 [exp-gui_task-list]
 caption-main=工作流程 [img=info]