Move the virtual layer into exp_scenario (#463)

The virtual layer was a legacy control module and a legacy gui built on
the legacy event system. The control module moves to
exp_scenario/module/control/vlayer.lua in the event_handler shape, with the
data typed and the allowed item table built locally rather than by
rewriting the config. The gui moves to exp_scenario/module/gui/vlayer.lua
in the shape of the other scenario guis: statistics as label and bar
defines refreshed from display data computed once, and the interface
controls as a define which owns its dropdowns.

Api changes while moving: interfaces are removed by entity rather than by
searching a position, the dead circuit wiring parameter is gone since
connect_neighbour no longer exists, and remove_item now takes only the
unallocated amount out of storage and counts that production back out of
the total, which the legacy module got wrong.

The locale moves to [exp-gui_vlayer] in en, zh-CN and zh-TW and the legacy
[vlayer] sections, modules and file loader entries are removed.

Co-authored-by: Cooldude2606 <25043174+Cooldude2606@users.noreply.github.com>

exp_scenario/module/control.lua

@@ -67,6 +67,7 @@ add(require("modules/exp_scenario/control/roles"))
 add(require("modules/exp_scenario/control/spawn_area"))
 add(require("modules/exp_scenario/control/spectate"))
 add(require("modules/exp_scenario/control/station_auto_name"))
+add(require("modules/exp_scenario/control/vlayer"))
 
 --- Guis
 add(require("modules/exp_scenario/gui/autofill"))
@@ -83,6 +84,7 @@ add(require("modules/exp_scenario/gui/rocket_info"))
 add(require("modules/exp_scenario/gui/science_production"))
 add(require("modules/exp_scenario/gui/surveillance"))
 add(require("modules/exp_scenario/gui/task_list"))
+add(require("modules/exp_scenario/gui/vlayer"))
 add(require("modules/exp_scenario/gui/warp_list"))
 add(require("modules/exp_scenario/gui/debug/shim"))
 add(require("modules/exp_scenario/gui/debug/event_view"))