MAINT-8990, MAINT-9002: First pass rework on environment panels, region/parcel

indra/llinventory/llsettingsbase.h

indra/llinventory/llsettingsdaycycle.cpp

indra/newview/llenvironment.cpp

indra/newview/llenvironment.h

indra/newview/llfloatereditextdaycycle.cpp

indra/newview/llfloatereditextdaycycle.h

indra/newview/llfloaterland.cpp

indra/newview/llfloaterregioninfo.cpp

indra/newview/llpanelenvironment.cpp

indra/newview/llpanelenvironment.h

indra/newview/llsettingspicker.cpp

indra/newview/llsettingspicker.h

indra/newview/llsettingsvo.cpp

indra/newview/llsettingsvo.h

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

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