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.

text/CeladonUniversityInside.asm

@@ -16,12 +16,10 @@ _CeladonUniversityInsideText2::
 	done
 
 _CeladonUniversityInsideText3::
-	text "Tremors keep"
-	line "happening in"
-	cont "VICTORY ROAD."
-	
-	para "WESTWOOD, can you"
-	line "meet me at SILPH?"
+	text "It's a paper"
+	line "speculating on"
+	cont "the idea of a"
+	cont "man-made #MON."
 	
 	done