Draft: Add low health battle music

[Leischii]

This started with me just wanting to expand the bgm for personal use but thought I could share it in case anyone wants to use it/pick it up. If anyone wants to finish this credits would be nice.

Changes:

• Added low health bgm audio from black and white
• Added logic to switch from current battle bgm to low health bgm when own pokemon is at or below 25% health
• Changed pbStringToAudioFile logic to split string at ":" instead of using 2 regex for most audio load. Should be a lot better for performance and also seems to reduce loading times.
• Added missing attr_accessor for bgs_position

Todos:

• Modify mp3 to loop better. Just picked a file I found for now
• Make sure bgm always changes according to own Pokemons health. I think I caught all instances, but due to being new to the project and ruby in general I'm not 100% sure
• Make sure spliting the string at ":" is actually better for performance and has no drawbacks. Couldn't find any instances of the ###:###:### format so I couldn't confirm it.

[Leischii]

Video:

https://cdn.discordapp.com/attachments/302153478556352513/1353152430027702362/infinitefusion_2025-03-23_00-40-50.mp4?ex=67e09ce7&is=67df4b67&hm=ffee279936c3baedfcac9c552cd10026c5aa4e53db0294172f7a6df8b4d04446&

[Leischii]

Update on this: I will finish this PR and expand it to be smth you could almost call a full on battle bgm overhaul.

Right now i am planing to:

• Improve current PR (I understand ruby a bit better now, so there is a lot I can improve already)
• Add logic for a new game setting called "music style" which allows you to choose between the current bgm implemention or a new one which makes it so everytime you enter a wild, trainer, rival, gym or elite4 battle, you will get a matching track from a random pokemon generation
• Add bgm and logic for last gym leader pokemon (matching the pokemon generation of the bgm playing at the time)
• Add correct bgm looping for all these tracks
• (Maybe) Add more audio effects (e.g. add the sound for the animation when the amount of pokemon each side has is shown via Pokeballs at the start of a trainer battle)

No eta as I'm still working on looping all audios and I have no idea how long this will take or if the scope might change again.