This commit adds a system which allows a pre-defined custom sound for the
noise a PDA makes when recieving a message, based on what the 'ringtone'
is set to. Ringtones without an entry will make the default beeping
noise.
Included special noises;
Explosion for 'boom'
Slipping noise for 'slip'
Bikehorn for 'honk'
Vox shriek for 'SKREE' (Capitals matter)
Shortened holy ambience music for 'holy'
Xenomorph hiss for 'xeno'
Also included; New folder, /sound/items/PDA/, specifically for the
ringtones.
Includes:
__credits.dm
Used for giving credit to the source of a sound file in said folder,
for sounds licensed under such a license that requires credit.
Not included in the compilation.
ambicha4-short.ogg
Shortened version of sound/ambience/ambicha4.ogg; Used for 'holy'
ringtone.
