STORM-1308: add help buttons and IDs to environment floaters

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

@@ -4,7 +4,7 @@
  height="450"
  layout="topleft"
  name="Edit Day cycle"
- help_topic=""
+ help_topic="day_presets"
  save_rect="true"
  title="Edit Day Cycle"
  width="800">

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

@@ -4,7 +4,7 @@
  height="375"
  layout="topleft"
  name="Edit Sky Preset"
- help_topic=""
+ help_topic="sky_preset"
  save_rect="true"
  title="Edit Sky Preset"
  width="900">
@@ -98,7 +98,7 @@
      layout="topleft"
      left="1"
      mouse_opaque="false"
-     help_topic="windlight_atmosphere_tab"
+     help_topic="sky_preset_atmosphere"
      name="Atmosphere"
      top="60"
      width="698">
@@ -379,7 +379,7 @@
          label="LIGHTING"
          layout="topleft"
          left_delta="0"
-         help_topic="windlight_lighting_tab"
+         help_topic="sky_preset_lighting"
          name="Lighting"
          top_delta="4"
          width="698">
@@ -685,7 +685,7 @@
          layout="topleft"
          left_delta="0"
          mouse_opaque="false"
-         help_topic="windlight_clouds_tab"
+         help_topic="sky_preset_clouds"
          name="Clouds"
          top_delta="4"
          width="698">

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

@@ -4,7 +4,7 @@
  height="450"
  layout="topleft"
  name="Edit Water Preset"
- help_topic=""
+ help_topic="water_preset"
  save_rect="true"
  title="Edit Water Preset"
  width="900">

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

@@ -5,6 +5,7 @@
  height="300"
  label="Environment"
  layout="topleft"
+ help_topic="panel_region_environment_tab"
  name="panel_env_info"
  width="530"> 
  <text