Mostly map edits and a few other tweaks

Underwater Tunnel is a new area that links Route 25 to Route 10, basically just being a straight tunnel needing Surf to traverse.

Also given Seafoam Islands and Lorelei's room an unused palette that gives it a more icy feel

text/DiglettsCave.asm

@@ -1,3 +1,13 @@
+_DiglettsCaveText1::
+	text "DANGER!"
+	line "A hostile CROCKY"
+	cont "is nesting here!"
+
+	para "Looks like the"
+	line "sign has many"
+	cont "bite marks."
+	done
+
 _CrockyBattleText::
 	text "Graogh!@"
 	text_end

text/GameCorner.asm

@@ -14,14 +14,14 @@ _CeladonGameCornerText_48d22::
 	para "Do you need some"
 	line "game coins?"
 
-	para "It's ¥1000 for 50"
-	line "coins. Would you"
-	cont "like some?"
+	para "It's ¥8000 for"
+	line "500 coins. Would"
+	cont "you like some?"
 	done
 
 _CeladonGameCornerText_48d27::
 	text "Thanks! Here are"
-	line "your 50 coins!"
+	line "your 500 coins!"
 	done
 
 _CeladonGameCornerText_48d2c::