SL-19575 Create emoji gallery access icon

indra/llui/llemojidictionary.h

indra/llui/llemojihelper.cpp

indra/llui/llemojihelper.h

indra/llui/llscrolllistctrl.cpp

indra/llui/lltexteditor.cpp

indra/llui/lltexteditor.h

indra/newview/CMakeLists.txt

indra/newview/llfloateremojipicker.cpp

indra/newview/llfloateremojipicker.h

indra/newview/llfloaterimsessiontab.cpp

indra/newview/llfloaterimsessiontab.h

indra/newview/llviewerfloaterreg.cpp

...ewview/skins/default/textures/icons/emoji_picker_icon.png

indra/newview/skins/default/textures/textures.xml

indra/newview/skins/default/xui/en/floater_emoji_picker.xml

indra/newview/skins/default/xui/en/floater_im_session.xml

indra/newview/skins/default/xui/en/strings.xml