pokecrystal home/ directory refactoring.

=== Legend ==
? unsure
~ file does not have much direction
! confident move
- "RTC/wSpriteUpdatesEnabled" relabelling

=== home/ fixes ===
? clear_sprites.asm -> functions/clear_sprites.asm
copy_name.asm -> functions/copy_name.asm
              -> functions/copy_string.asm
			  -> move to home.asm
copy_tilemap.asm -> functions/copy_tilemap.asm
                 -> functions/tilemap_backup.asm
				 -> functions/backup_tilemap.asm
				 -> functions/backup_restore_tilemap.asm
~ flag.asm -> add debug flag code right after
~ map_objects.asm -> unsure, keep for now, probably needs a dedicated PR to fix it
~ mon_data.asm, mon_data_2.asm -> move to home.asm
                               -> move Unreferenced_GetNthMove to home.asm
							       -> move GetBaseData to:
							           -> base_data.asm
									   -> get_base_data.asm
							       -> move GetCurNick + GetNick to:
								       -> get_mon_attribute_1.asm
									   -> functions/get_mon_nick.asm
									   -> get_mon_nick.asm
									   -> home.asm
								   -> move GetPartyParamLocation + GetPartyLocation to:
								       -> functions/get_mon_param(_2).asm
									   -> home.asm
								   -> move Unreferenced_GetDexNumber to home.asm
~ mon_stats.asm -> move to home.asm
movement.asm -> move menu related code to another file or to home.asm
                 -> rename movement.asm to:
				     -> scripted_movement.asm
		             -> apply_movement.asm
! print_text.asm -> move PrintLetterDelay to print_letter_delay.asm, move other functions to home.asm
                 -> move print_text.asm to home.asm
! region.asm -> move to home.asm
             -> move to functions/is_in_johto.asm
			 -> rename IsInJohto to CheckRegion, and rename region.asm to:
			     -> check_region.asm
				 -> functions/check_region.asm
				 -> move to home.asm
- rtc.asm
~ scrolling_menu.asm -> move JoyTextDelay_ForcehJoyDown out of scrolling_menu.asm
                     -> move scrolling_menu.asm to home.asm
					 -> JoyTextDelay_ForcehJoyDown is related to "pad selection" (quantity selector, time menu)
! sprite_anims.asm -> move PushLYOverrides to home.asm
- sprite_updates.asm
! string.asm -> move to home.asm
~ tilemap.asm -> unsure, keep for now
! time.asm -> rtc.asm after "RTC/wSpriteUpdatesEnabled" relabelling
! trainers.asm -> map_trainers.asm
               -> trainer_engage.asm
~ window.asm -> unsure, keep for now