Fixes #5394 Spawnpoint dropdown count

Fixes where the spawn point dropdown would show the same number of spawn
points as the number of players rather than the actual number of
available spawn points.
Fixed TraitDictionary.Contains to use Any() rather than Count() != 0.

This means it can bail early if a match is found.
fix + replace Hegemony or Survival with 4p version
There were a few leftover minor aesthetic issues with the map which I
quickly fixed.
I decided that not many people would play the 8P version of this map, so I
made the 4P version the one included. It's actually fun.
re-add 8-player version of HoS, with "8P" title
Includes same minor aesthetic fixes as 4P version.
new map: "Profit Over People" (1vs1)
improved "Deterring Democracy". Better tib.
Changed layout of tiberium, especially blue tib.
Removed hospitals.
minor: removed "C&C" from the title of Haos Ridges
Reduce Grenadier dmg vs. heavy from 50% -> 35%

Grenadier is a wee bit too powerful vs. everything. 
This will keep its value vs. heavy armor still very high, but not OP like it is for the cost. 
(Grenadier will still have highest DPS vs. heavy as a function of cost, after this nerf).
Fix #5414
Merge pull request #5407 from psydev/maps

Maps: 1 new map, 2 map updates
Merge pull request #5402 from RoosterDragon/traitdictionary-contains

Fixed TraitDictionary.Contains to use Any() rather than Count() != 0.
Merge pull request #5413 from psydev/patch-1

Reduce Grenadier dmg vs. heavy from 50% -> 35%
Merge pull request #5399 from Squiggles211/spawn_choices

Fixes #5394 Spawnpoint dropdown count
Remove contrails from AA Gun and Sniper. Fixes #5417.
Merge pull request #5418 from pchote/bullet-contrails

Remove contrails from AA Gun and Sniper.
Fix TD spawn dialog dropdown background.
Adjust news dialog layout.
Point news url at the website.
Merge pull request #5419 from pchote/news

Ingame news tweaks
Avoid a loop closure issue that caused incorrect sequence lookups.