SL-19982 Adjustable font size in LSL editor

indra/llui/llkeywords.cpp

indra/llui/llkeywords.h

indra/newview/app_settings/settings.xml

indra/newview/llfloaterpreference.cpp

indra/newview/llinventoryfunctions.cpp

indra/newview/llinventoryfunctions.h

indra/newview/llpreviewscript.cpp

indra/newview/llpreviewscript.h

indra/newview/llscripteditor.cpp

indra/newview/llscripteditor.h

...wview/skins/default/textures/icons/Icon_Color_Palette.png

...a/newview/skins/default/textures/icons/Icon_Font_Size.png

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

.../newview/skins/default/xui/en/floater_script_ed_prefs.xml

...a/newview/skins/default/xui/en/floater_script_preview.xml

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

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

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