sprites: upgrade health pickups.

Korp's medikit and stimpack as shared on the Discord, recoloured to use the Doom palette.

The health bonus originally started out as my recolour of Korp's green bottle to give it the same yellow colour coding as the hyperdrive sphere. (If it looks too much like the medical pickups the health going over 100% looks like a bug.) The design I ended up with is inspired by Pac-Man's dots and Unreal's health plants.

The berserk is reshaded and given a similar cylindrical look to the stimpack. The face is no longer a human skull but something more alien.

buildcfg.txt

@@ -2276,10 +2276,10 @@ BKEYB0	7	19
 BLUDA0	7	5
 BLUDB0	8	7
 BLUDC0	7	7
-BON1A0	6	19
+BON1A0	5	21
-BON1B0	6	19
+BON1B0	5	21
-BON1C0	6	19
+BON1C0	6	21
-BON1D0	6	19
+BON1D0	6	21
 BON2A0	6	19
 BON2B0	6	19
 BON2C0	6	19
@@ -2302,7 +2302,7 @@ IFOGC0 25 44
 IFOGD0 25 44
 IFOGE0 25 44
 LAUNA0	30	20
-MEDIA0	13	19
+MEDIA0	14	20
 MGUNA0	25	25
 MISGA0	-111 -104
 MISGB0	-107 -106
@@ -2467,7 +2467,7 @@ SOULA0	12	32
 SOULB0	12	32
 SOULC0	12	32
 SOULD0	12	32
-STIMA0	8	18
+STIMA0	10	10
 SUITA0	11	52
 TFOGA0 25 59
 TFOGB0 25 59
@@ -2598,7 +2598,7 @@ POL3B0	19	48
 POL4A0	19	51
 POL6A0	14	62
 POL6B0	15	62
-PSTRA0	14	19
+PSTRA0	16	18
 RSKUA0	6	17
 RSKUB0	6	17
 SMBTA0	12	70