Finish Chief, bug fixes

This finishes Chief's event, with all the necessary components for the post-game Mewtwo fight sorted as well. I added an event the Master Ball sets for modular monologue text, for improved immersion.

I have also fixed some bugs;
- Fixed the oft-reported walking in trees bug in the Forest tileset.
- Fixed the Oak's lab computer issue by just...removing the computer. I made the map symmetrical instead, feels a lot better to look at, at least for me. I think it was meant to have an event on it or something, but I couldn't find anything, felt like I was being gaslit.
- Hopefully fixed the issue with the border blocks going weird after saving and resetting, by making the tileset directly point to the gym one, which Oak is meant to use. I am not sure how that glitch happened for ViWalls.
- Fixed the Viridian Pre-Gym text scrolling issue.

I still cannot replicate the crash bugs that some people have been experiencing and don't see anything that could be causing it.

I also changed Trampel in Victory Road to Steelix, as mentioned by Gogocrafter.

data/maps/headers/OaksLab.asm

@@ -1,2 +1,2 @@
-	map_header OaksLab, OAKS_LAB, DOJO, 0
+	map_header OaksLab, OAKS_LAB, GYM, 0
 	end_map_header

data/maps/objects/RedsHouse2F.asm

@@ -3,8 +3,8 @@ RedsHouse2F_Object:
 
 	def_warp_events
 	warp_event  7,  1, REDS_HOUSE_1F, 3
-	;warp_event  5,  1, SILPH_GAUNTLET_7F, 1 ; - Test Chief 
-	warp_event  5,  1, SILPH_CO_11F, 2 ; - Test J&J, Omega, & Giovanni. To test the Omega refight, change to SHOW in hide/show data, and set warp ID to 1.
+	warp_event  5,  1, SILPH_GAUNTLET_7F, 1 ; - Test Chief 
+	;warp_event  5,  1, SILPH_CO_11F, 2 ; - Test J&J, Omega, & Giovanni. To test the Omega refight, change to SHOW in hide/show data, and set warp ID to 1.
 	;warp_event  5,  1, ROCKET_HIDEOUT_B4F, 2 ; - Test Giovanni 1
 	;warp_event  5,  1, MT_MOON_SQUARE, 1 ; - Test Shop, NPCs, and Crater
 	;warp_event  5,  1, CELESTE_HILL, 1 ; - Test GMolt

data/maps/objects/SaffronCity.asm

@@ -10,6 +10,7 @@ SaffronCity_Object:
 	warp_event 18, 21, SILPH_CO_1F, 1
 	warp_event  9, 29, SAFFRON_POKECENTER, 1
 	warp_event 29, 29, MR_PSYCHICS_HOUSE, 1
+	warp_event 18, 22, SILPH_GAUNTLET_7F, 1 ; Not actually usable. Used as a target for the warp in the gauntlet.
 
 	def_bg_events
 	bg_event 17,  5, 16 ; SaffronCityText16

data/maps/objects/SilphGauntlet7F.asm

@@ -2,9 +2,12 @@ SilphGauntlet7F_Object:
 	db $d ; border block
 
 	def_warp_events
-	warp_event  5,  6, SAFFRON_CITY, 1
+	warp_event  5,  6, SAFFRON_CITY, 9
 
 	def_bg_events
+	bg_event  2,  2, 2 ; Chief's PC
+	bg_event  2,  0, 3 ; Chief's first painting
+	bg_event  8,  0, 4 ; Chief's second painting
 
 	def_object_events
 	object_event  5,  1, SPRITE_SILPH_PRESIDENT, STAY, DOWN, 1 ; person

data/tilesets/collision_tile_ids.asm

@@ -24,7 +24,7 @@ Gym_Coll::
 	coll_tiles $11, $16, $19, $2b, $3c, $3d, $3f, $4a, $4c, $4d, $03
 
 Forest_Coll::
-	coll_tiles $1e, $20, $2e, $30, $34, $37, $39, $3a, $40, $51, $52, $5a, $5c, $5e, $5f, $00, $30
+	coll_tiles $1e, $20, $2e, $30, $34, $37, $39, $3a, $40, $51, $52, $5a, $5c, $5e, $5f, $30
 
 House_Coll::
 	coll_tiles $01, $12, $14, $28, $32, $37, $44, $54, $5c

data/wild/maps/VictoryRoad1F.asm

@@ -1,7 +1,7 @@
 VictoryRoad1FWildMons:
 	def_grass_wildmons 15 ; encounter rate
 	db 34, MACHOKE
-	db 36, RHYDON
+	db 36, STEELIX
 	db 32, GOLBAT
 	db 36, SANDSLASH
 	db 39, SANDSLASH

data/wild/maps/VictoryRoad2F.asm

@@ -1,7 +1,7 @@
 VictoryRoad2FWildMons:
 	def_grass_wildmons 10 ; encounter rate
 	db 32, MACHOKE
-	db 34, TRAMPEL
+	db 34, STEELIX
 	db 36, GOLBAT
 	db 36, SANDSLASH
 	db 39, SANDSLASH

data/wild/maps/VictoryRoad3F.asm

@@ -1,7 +1,7 @@
 VictoryRoad3FWildMons:
 	def_grass_wildmons 15 ; encounter rate
 	db 34, MACHOKE
-	db 36, TRAMPEL
+	db 36, STEELIX
 	db 32, GOLBAT
 	db 42, SANDSLASH
 	db 40, VENOMOTH