Feature/mipmapping (#454)

* Enable mipmapping for textures where it was previously disabled

* Fix mipmapping for renderable projections

data/assets/scene/solarsystem/missions/newhorizons/hydra.asset

@@ -56,7 +56,8 @@ local HydraText = {
         Size = 10.0^6.3,
         Origin = "Center",
         Billboard = true,
-        Texture = textures .. "/Hydra-Text.png"
+        Texture = textures .. "/Hydra-Text.png",
+        BlendMode = "Additive"
     },
     GuiPath = "/Solar System/Dwarf Planets/Pluto"
 }

data/assets/scene/solarsystem/missions/newhorizons/nix.asset

@@ -47,7 +47,8 @@ local NixText = {
         Size = 10^6.3,
         Origin = "Center",
         Billboard = true,
-        Texture = textures .. "/Nix-Text.png"
+        Texture = textures .. "/Nix-Text.png",
+        BlendMode = "Additive"
     },
     GuiPath = "/Solar System/Dwarf Planets/Pluto"
 }

data/assets/scene/solarsystem/missions/newhorizons/pluto.asset

@@ -182,14 +182,15 @@ local Pluto = {
 }
 
 local PlutoBarycenterLabel = {
-   Name = "PlutoBarycenterLabel",
-   Parent = transforms.PlutoBarycenter.Name,
-   Renderable = {
-       Type = "RenderablePlane",
-       Billboard = true,
-       Size = 5E4,
-       Texture = encounterTextures .. "/barycenter.png"
-   },
+    Name = "PlutoBarycenterLabel",
+    Parent = transforms.PlutoBarycenter.Name,
+    Renderable = {
+        Type = "RenderablePlane",
+        Billboard = true,
+        Size = 5E4,
+        Texture = encounterTextures .. "/barycenter.png",
+        BlendMode = "Additive"
+    },
     GuiPath = "/Solar System/Dwarf Planets/Pluto"
 }