New REM client: drop the old plugins and hook leftovers, art sources to ART/UI

The native REM client replaces the dacom plugins (rem-essentials, jflp, numeric,
moors, ranks, shipclass, engclass, storyfactions, ...), the FLAR / ReShade /
DLSS renderer hooks and the Lua event scripts of the ClientHook (all empty or
unused); dacom.ini and dacomsrv.ini no longer load them. flserver.exe and
mysqlcppconn.dll belong to the server. The first-person camera zones are
deferred. The ClientHook's pictures move to ART/UI as the sources of the
generators in tools. REM/Audio and REM/Avatars stay.

tools/make_hud_txm.py

@@ -10,9 +10,9 @@ DATA\\INTERFACE\\REM\\rem_hud.ini lists the textures as shapes (tex_shape = REM_
 Example (the shipped file):
 
     python tools/make_hud_txm.py DATA/INTERFACE/REM/rem_hud.txm \\
-        skull=EXE/REM/UI/ICON/skull_icon.png \\
-        probe=EXE/REM/UI/ICON/sensorprobe_active.png \\
-        menu=EXE/REM/UI/ICON/target_menu.png
+        skull=ART/UI/ICON/skull_icon.png \\
+        probe=ART/UI/ICON/sensorprobe_active.png \\
+        menu=ART/UI/ICON/target_menu.png
 """
 import os
 import sys