removed unused textures

indra/newview/skins/default/textures/arrow_keys.png

...ewview/skins/default/textures/bottomtray/Cam_Pan_Over.png

...ew/skins/default/textures/bottomtray/CameraView_Press.png

...w/skins/default/textures/bottomtray/PanOrbit_Disabled.png

...wview/skins/default/textures/bottomtray/PanOrbit_Over.png

...view/skins/default/textures/bottomtray/PanOrbit_Press.png

...w/skins/default/textures/checkerboard_transparency_bg.png

indra/newview/skins/default/textures/circle.tga

...efault/textures/containers/Accordion_ArrowClosed_Over.png

...efault/textures/containers/Accordion_ArrowOpened_Over.png

...ew/skins/default/textures/containers/TabTop_Left_Over.png

.../skins/default/textures/containers/TabTop_Middle_Over.png

...w/skins/default/textures/containers/TabTop_Right_Over.png

indra/newview/skins/default/textures/icn_label_web.tga

indra/newview/skins/default/textures/icn_media.tga

...a/newview/skins/default/textures/icn_voice-groupfocus.tga

indra/newview/skins/default/textures/icn_voice-localchat.tga

indra/newview/skins/default/textures/icn_voice-pvtfocus.tga

indra/newview/skins/default/textures/icon_day_cycle.tga

indra/newview/skins/default/textures/icon_event_adult.tga