Identify all mobile-related functions and rename numbered mobile code files

[rawr51919]

Since mobile isn't exactly the most understood thing right now, perhaps an emulator that can emulate the JP Crystal mobile functionality might be useful for the identification of these functions as well as the files and mobile-related code within.
This was touched upon in #951 and was determined that it requires it's own issue as well as a proper way to test mobile functionality in some way
This may go a long way towards resolving #626 because of the nature of what needs to be accomplished to address this

• mobile/fixed_words.asm
• mobile/mobile_12.asm
• mobile/mobile_12_2.asm
• mobile/mobile_22.asm
• mobile/mobile_22_2.asm
• mobile/mobile_40.asm
• mobile/mobile_41.asm
• mobile/mobile_42.asm
• mobile/mobile_45.asm
• mobile/mobile_45_2.asm
• mobile/mobile_45_sprite_engine.asm
• mobile/mobile_45_stadium.asm
• mobile/mobile_46.asm
• mobile/mobile_5b.asm
• mobile/mobile_5c.asm
• mobile/mobile_5e.asm
• mobile/mobile_5f.asm
• mobile/mobile_menu.asm
• mobile/print_opp_message.asm