Reverted names of Unknowns

Reverted names of two Unknowns in BSShaderPPLightingProperty to "Unknown Float 4" and "Unknown Float 5". Also renamed "Envmap Scale" in BSShaderProperty to "Environment Map Scale" and added its description of funtionality - it is same as "Environment Map Scale" in BSLightingShaderProperty - controls the intesity of the environment map.

nif.xml

@@ -4664,7 +4664,7 @@
         <add name="Shader Type" type="BSShaderType" default="SHADER_DEFAULT">Unknown (Set to 0x21 for NoLighting, 0x11 for Water)</add>
         <add name="Shader Flags" type="BSShaderFlags" default="0x82000000">Shader Property Flags</add>
         <add name="Shader Flags 2" type="BSShaderFlags2" default="1">Shader Property Flags 2</add>
-        <add name="Envmap Scale" type="float" default="1.0" vercond="User Version == 11">Unknown</add>
+        <add name="Environment Map Scale" type="float" default="1.0" vercond="User Version == 11">Scales the intensity of the environment/cube map.</add>
     </niobject>
 
     <niobject name="BSShaderLightingProperty" abstract="1" inherit="BSShaderProperty">
@@ -4686,8 +4686,8 @@
         <add name="Texture Set" type="Ref" template="BSShaderTextureSet">Texture Set</add>
         <add name="Refraction Strength" type="float" default="0.0" vercond="(User Version == 11) &amp;&amp; (User Version 2 &gt; 14)">The amount of distortion. **Not based on physically accurate refractive index** (0=none) (0-1)</add>
         <add name="Refraction Fire Period" type="int" default="0" vercond="(User Version == 11) &amp;&amp; (User Version 2 &gt; 14)">Rate of texture movement for refraction shader.</add>
-        <add name="Unknown Float 1" type="float" default="4.0" vercond="(User Version == 11) &amp;&amp; (User Version 2 &gt; 24)">Unknown</add>
-        <add name="Unknown Float 2" type="float" default="1.0" vercond="(User Version == 11) &amp;&amp; (User Version 2 &gt; 24)">Unknown</add>
+        <add name="Unknown Float 4" type="float" default="4.0" vercond="(User Version == 11) &amp;&amp; (User Version 2 &gt; 24)">Unknown</add>
+        <add name="Unknown Float 5" type="float" default="1.0" vercond="(User Version == 11) &amp;&amp; (User Version 2 &gt; 24)">Unknown</add>
         <add name="Emissive Color" type="Color4" vercond="User Version >= 12">Glow color and alpha</add>
     </niobject>