Feature/numeric slider updates (#1609)

* Remove Logarithmic ViewOption and instead always use exponent of NumericalProperty + set exponent of some renderables' properties

* Add MinMaxRange ViewOption for Vec2 properties

* Add MinMaxRange viewoption to some existing vec2 properties and combine some other related properties to be able to utilize it. For example Min and Max label sizes, fade in/out distances, inner and outer radius. OBS! Includes renaming several properties (**breaking change**)

* Refactor and document labels code. OBS! Includes renaming several properties (**breaking change**)

* Add comments for some assets that have labels that are not working correctly


Renderables with rename properties: RenderableLabels , GlobeLabelsComponent, RenderableBillboardsCloud, RenderableDUMeshes, RenderableRadialGrid )

modules/base/rendering/renderabledisc.cpp

@@ -97,7 +97,7 @@ RenderableDisc::RenderableDisc(const ghoul::Dictionary& dictionary)
     _texturePath.onChange([&]() { _texture->loadFromFile(_texturePath.value()); });
     addProperty(_texturePath);
 
-    _size.setViewOption(properties::Property::ViewOptions::Logarithmic);
+    _size.setExponent(13.f);
     _size = p.size.value_or(_size);
     setBoundingSphere(_size);
     _size.onChange([&]() { _planeIsDirty = true; });