[Added] [Map] Gerion Signature zones

[benjcallaghan]

These zones are early in the Rage of Cthurath signature lines, but they reuse maps from other dungeons.

<ImageStyle Name="exp22_dun_plane_of_avarice_sig" displayname="Gerion, Hold of D'Lere [Signature]" zonerect="-540, -35, -147, 423">
<ImageFrame Source="images/maps/exp22_dun_plane_of_avarice_02.dds" SourceRect="0,0,436,508" />
</ImageStyle>

<ImageStyle Name="exp22_dun_plane_of_avarice_tradeskill" displayname="Gerion: Ark of Ascension [Tradeskill]" zonerect="-193, -624, 194, -173" heightmax="20">
<ImageFrame Source="images/maps/exp22_dun_plane_of_avarice_01_0.dds" SourceRect="0,0,436,508" />
</ImageStyle>