New SFX sounds.
add_item.wav (Better fitting pickup sound)
drop_item.wav (New sound for dropping items)
open_inventory.wav (The old pickup sound, can be used for opening the bag but needs to be implemented)
sword_in.wav (Better fitting sound)
sowrd_out.wav (Better fitting sound)
Fixed the drop sfx sound in sfx.ron
Its the drop_item sound instead of a grass moving step.
This clears out about 56MB of unused audio files.
There were also some unused methods in the audio modules which
referenced a file, which has also been removed.
This is an event based approach to SFX sounds. There is a specific
character sound event mapper which determines sfx to play based on
character or NPC state, as well as emitting sfx events for
non-character-triggers such as levelling up.
