MAP05: Gameplay and compatibility fixes

- Remove the extraneous secret room accessible right from the start.
- Increase the floor height of sector holding the red fake key, so it
  is better visible from the outside.
- Entirely remove the dull rectangular sector that once surrounded the
  Doom logo.
- Change the texture of the wall leading to the backpack secret.
- Remove the teleport from the super-secret room (accessible from the
  backpack secret) that lead to the northern-most sector behind the
  bars, instead add a switch to the super-secret room to lower the three
  bars on the left of that sector.
- The three bars on the right of that sector are now lowered when the
  switch lowering the fake red key and unveiling the real red key is
  activated.
- Move the invisible secret switch revealing the rocket launcher
  secret to the switch at the northern end of the northern-most
  corridor (it is still hard enough to discover, after all).
- The three eastern blue bars are now directly switchable (just as
  their western counterparts), remove switches from the walls on
  either sides.
- Turn the sector surrounding the yellow key back into damaging lava
  (it is in a hell area after all), but leave it escapable.
- Also, turn the sector surrounding the rocket launcher back into
  damaging nukage.
- Replace the two Barons guarding the red key by Cacodemons.
- Replace a stuck demon in the yellow key area by a Chaingunner.
- Change linedef on lift into yellow/red key area to type 88.

- Baptize the map "Waste Water Basin" in 'lumps/fraggle/freedoom.bex'.

TODO: Thing placement!

lumps/fraggle/freedoom.bex

@@ -186,7 +186,7 @@ HUSTR_1 = MAP01: Hydroelectric Plant
 HUSTR_2 = MAP02: Filtration Tunnels
 HUSTR_3 = MAP03: Crude Processing Center
 HUSTR_4 = MAP04: Containment Bay
-HUSTR_5 = MAP05
+HUSTR_5 = MAP05: Waste Water Basin
 HUSTR_6 = MAP06
 HUSTR_7 = MAP07: Outer Storage Warehouse
 HUSTR_8 = MAP08