Fix a few Gen III items' sprites' filenames.

Still missing:
- Rm. 1/2/4 Key (slightly different from Rm. 6 Key's icon!)
- Old Sea Chart (Emerald only)
- Magma Emblem (Emerald only)

diff --git a/items/aurora-ticket.png b/items/auroraticket.png
similarity index 100%
rename from items/aurora-ticket.png
rename to items/auroraticket.png

diff --git a/items/gorgeous-mail.png b/items/fab-mail.png
similarity index 100%
rename from items/gorgeous-mail.png
rename to items/fab-mail.png

diff --git a/items/voice-checker.png b/items/fame-checker.png
similarity index 100%
rename from items/voice-checker.png
rename to items/fame-checker.png

diff --git a/items/pokedoll.png b/items/gen3/poké-doll.png
similarity index 100%
rename from items/pokedoll.png
rename to items/gen3/poké-doll.png

diff --git a/items/pika-mail.png b/items/glitter-mail.png
similarity index 100%
rename from items/pika-mail.png
rename to items/glitter-mail.png

diff --git a/items/wingull-mail.png b/items/harbor-mail.png
similarity index 100%
rename from items/wingull-mail.png
rename to items/harbor-mail.png

diff --git a/items/elevator-key.png b/items/lift-key.png
similarity index 100%
rename from items/elevator-key.png
rename to items/lift-key.png

diff --git a/items/magnemite-mail.png b/items/mech-mail.png
similarity index 100%
rename from items/magnemite-mail.png
rename to items/mech-mail.png

diff --git a/items/mystery-ticket.png b/items/mysticticket.png
similarity index 100%
rename from items/mystery-ticket.png
rename to items/mysticticket.png

diff --git a/items/zigzagoon-mail.png b/items/orange-mail.png
similarity index 100%
rename from items/zigzagoon-mail.png
rename to items/orange-mail.png

diff --git a/items/pokeflute.png b/items/poké-flute.png
similarity index 100%
rename from items/pokeflute.png
rename to items/poké-flute.png

diff --git a/items/pokeblock-case.png b/items/pokéblock-case.png
similarity index 100%
rename from items/pokeblock-case.png
rename to items/pokéblock-case.png

diff --git a/items/ruby-plate.png b/items/ruby.png
similarity index 100%
rename from items/ruby-plate.png
rename to items/ruby.png

diff --git a/items/sapphire-plate.png b/items/sapphire.png
similarity index 100%
rename from items/sapphire-plate.png
rename to items/sapphire.png

diff --git a/items/duskull-mail.png b/items/shadow-mail.png
similarity index 100%
rename from items/duskull-mail.png
rename to items/shadow-mail.png

diff --git a/items/bellossom-mail.png b/items/tropic-mail.png
similarity index 100%
rename from items/bellossom-mail.png
rename to items/tropic-mail.png

diff --git a/items/wailmer-mail.png b/items/wave-mail.png
similarity index 100%
rename from items/wailmer-mail.png
rename to items/wave-mail.png

diff --git a/items/slakoth-mail.png b/items/wood-mail.png
similarity index 100%
rename from items/slakoth-mail.png
rename to items/wood-mail.png