Organize mobile/battle_tower_*.asm data and code

engine/events/battle_tower/get_trainer_class.asm

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+GetMobileOTTrainerClass: ; mobile function
+	ld h, b
+	ld l, c
+	call .GetMobileOTTrainerClass
+	ld c, a
+	ret
+
+.GetMobileOTTrainerClass: ; 4e930
+	ld a, [hli]
+	xor [hl]
+	ld c, a
+	jr z, .skip_male_trainers
+	srl c
+	srl c
+.male_trainer_loop
+	srl c
+	ld a, c
+	cp MaleTrainersEnd - MaleTrainers - 1
+	jr nc, .male_trainer_loop
+	inc c
+
+.skip_male_trainers
+	ld a, [de]
+	cp $1
+	ld hl, MaleTrainers
+	jr nz, .finished
+
+	ld hl, FemaleTrainers
+	ld a, c
+	and a
+	jr z, .finished
+
+.female_trainer_loop
+	srl c
+	ld a, c
+	cp FemaleTrainersEnd - FemaleTrainers - 1
+	jr nc, .female_trainer_loop
+	inc c
+
+.finished
+	ld b, $0
+	add hl, bc
+	ld a, [hl]
+	ret
+
+INCLUDE "data/trainers/gendered_trainers.asm"