sprites: new armour pickups. (#860)

* sprites: new armour pickups.

At this point they're not really just "vests" anymore so I've changed the pickup message as well.

* sprites: darken armor pickup shadows.

The darkest bits were far too light, making the sprites look floaty and billboardy compared to typical (Free)Doom assets.

buildcfg.txt

@@ -2244,10 +2244,10 @@ MANFB8B2	35	18
 ; These are normal items that appear in both Freedoom and FreeDM.
 
 AMMOA0	8	16
-ARM1A0	15	17
-ARM1B0	15	17
-ARM2A0	15	22
-ARM2B0	15	22
+ARM1A0	18	28
+ARM1B0	18	28
+ARM2A0	18	28
+ARM2B0	18	28
 BAL1A0	8	12
 BAL1B0	8	12
 BAL1C0	17	21

lumps/dehacked/dehacked.txt

@@ -142,8 +142,8 @@ STARTUP5========================================================================
 #else
 STARTUP5============================================================================\nThis is Freedoom, the free content first person shooter.\n\nFreedoom is freely redistributable under the terms of the modified BSD\nlicense. Check out the Freedoom website for more information:\n\n    https://freedoom.github.io/\n============================================================================
 #endif
-GOTARMOR = Picked up a light armor vest.
-GOTMEGA = Picked up a heavy armor vest.
+GOTARMOR = Picked up some basic infantry armor.
+GOTMEGA = Picked up some heavy assault armor.
 GOTHTHBONUS = Got a 1% health bonus.
 GOTARMBONUS = Got a 1% armor bonus.
 GOTSTIM = Picked up a small health pack.