Add option to control hover text fade distance and range.

No UI yet.

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

+<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
+<panel
+ border="true"
+ follows="left|top|right|bottom"
+ height="408"
+ label="Interface"
+ layout="topleft"
+ left="102"
+ name="Interface panel"
+ top="1"
+ width="517">
+  <text
+     type="string"
+     length="1"
+     follows="left|top"
+     height="10"
+     layout="topleft"
+     left="30"
+     name="Network:"
+     mouse_opaque="false"
+     top="10"
+     width="300">
+    Floating Text:
+  </text>
+  <text
+   type="string"
+   length="1"
+   follows="left|top"
+   height="10"
+   layout="topleft"
+   left="50"
+   name="Maximum bandwidth"
+   mouse_opaque="false"
+   top_pad="10"
+   width="200">
+    Fade Distance
+  </text>
+  <slider
+   can_edit_text="true"
+   control_name="AlchemyHudTextFadeDistance"
+   decimal_digits="2"
+   follows="left|top"
+   height="15"
+   increment="0.05"
+   initial_value="4.0"
+   layout="topleft"
+   left_delta="150"
+   max_val="128"
+   min_val="1"
+   name="text_draw_distance"
+   top_delta="0"
+   width="180" />
+  <text
+   type="string"
+   length="1"
+   follows="left|top"
+   height="10"
+   layout="topleft"
+   left_pad="6"
+   mouse_opaque="false"
+   name="text_box2"
+   top_delta="1"
+   width="200">
+    m
+  </text>
+  <text
+   type="string"
+   length="1"
+   follows="left|top"
+   height="10"
+   layout="topleft"
+   left="50"
+   name="Maximum bandwidth"
+   mouse_opaque="false"
+   top_pad="10"
+   width="200">
+    Fade Range
+  </text>
+  <slider
+   can_edit_text="true"
+   control_name="AlchemyHudTextFadeRange"
+   decimal_digits="2"
+   follows="left|top"
+   height="15"
+   increment="0.05"
+   initial_value="8.0"
+   layout="topleft"
+   left_delta="150"
+   max_val="64"
+   min_val="1"
+   name="text_draw_distance"
+   top_delta="0"
+   width="180" />
+  <text
+   type="string"
+   length="1"
+   follows="left|top"
+   height="10"
+   layout="topleft"
+   left_pad="6"
+   mouse_opaque="false"
+   name="text_box2"
+   top_delta="1"
+   width="200">
+    m
+  </text>
+  <check_box
+    control_name="AlchemyCinematicModeHideHoverText"
+    height="16"
+    initial_value="true"
+    label="Hide in Cinematic Mode"
+    layout="topleft"
+    left="45"
+    name="HideHoverTextInCinematicMode"
+    top_delta="20"
+    width="256">
+    <check_box.commit_callback
+      function="Pref.RenderOptionUpdate" />
+  </check_box>
+</panel>