Remove dead class3 deferred shaders

...p_settings/shaders/class3/deferred/attachmentShadowF.glsl

...p_settings/shaders/class3/deferred/attachmentShadowV.glsl

...w/app_settings/shaders/class3/deferred/avatarShadowF.glsl

...w/app_settings/shaders/class3/deferred/avatarShadowV.glsl

...ew/app_settings/shaders/class3/deferred/cloudShadowF.glsl

...ew/app_settings/shaders/class3/deferred/cloudShadowV.glsl

...newview/app_settings/shaders/class3/deferred/cloudsF.glsl

...newview/app_settings/shaders/class3/deferred/cloudsV.glsl

...ettings/shaders/class3/deferred/depthToShadowVolumeG.glsl

...ew/app_settings/shaders/class3/deferred/gatherSkyShF.glsl

...ew/app_settings/shaders/class3/deferred/gatherSkyShV.glsl

...wview/app_settings/shaders/class3/deferred/genSkyShF.glsl

...wview/app_settings/shaders/class3/deferred/genSkyShV.glsl

...app_settings/shaders/class3/deferred/multiSpotLightF.glsl

...pp_settings/shaders/class3/deferred/pointShadowBlurF.glsl

.../newview/app_settings/shaders/class3/deferred/shVisF.glsl

.../newview/app_settings/shaders/class3/deferred/shVisV.glsl

...p_settings/shaders/class3/deferred/shadowAlphaBlendF.glsl

...p_settings/shaders/class3/deferred/shadowAlphaBlendV.glsl

...pp_settings/shaders/class3/deferred/shadowAlphaMaskF.glsl