Add missing categories group to crystalsvg theme file

pics/crystalsvg/index.theme

@@ -115,7 +115,7 @@ SmallDefault=16
 SmallSizes=16
 PanelDefault=32
 PanelSizes=16,22,32,48,64,128
-Directories=16x16/actions,16x16/apps,16x16/devices,16x16/places,16x16/mimetypes,22x22/actions,22x22/apps,22x22/devices,22x22/places,22x22/mimetypes,32x32/actions,32x32/apps,32x32/devices,32x32/places,32x32/mimetypes,48x48/actions,48x48/apps,48x48/devices,48x48/places,48x48/mimetypes,64x64/actions,64x64/apps,64x64/devices,64x64/places,64x64/mimetypes,128x128/actions,128x128/apps,128x128/devices,128x128/places,128x128/mimetypes
+Directories=16x16/actions,16x16/apps,16x16/categories,16x16/devices,16x16/places,16x16/mimetypes,22x22/actions,22x22/apps,22x22/categories,22x22/devices,22x22/places,22x22/mimetypes,32x32/actions,32x32/apps,32x32/categories,32x32/devices,32x32/places,32x32/mimetypes,48x48/actions,48x48/apps,48x48/categories,48x48/devices,48x48/places,48x48/mimetypes,64x64/actions,64x64/apps,64x64/categories,64x64/devices,64x64/places,64x64/mimetypes,128x128/actions,128x128/apps,128x128/categories,128x128/devices,128x128/places,128x128/mimetypes
 [16x16/actions]
 Size=16
 Context=Actions
@@ -124,6 +124,10 @@ Type=Threshold
 Size=16
 Context=Applications
 Type=Threshold
+[16x16/categories]
+Size=16
+Context=Categories
+Type=Threshold
 [16x16/devices]
 Size=16
 Context=Devices
@@ -144,6 +148,10 @@ Type=Threshold
 Size=22
 Context=Applications
 Type=Threshold
+[22x22/categories]
+Size=22
+Context=Categories
+Type=Threshold
 [22x22/devices]
 Size=22
 Context=Devices
@@ -164,6 +172,10 @@ Type=Threshold
 Size=32
 Context=Applications
 Type=Threshold
+[32x32/categories]
+Size=32
+Context=Categories
+Type=Threshold
 [32x32/devices]
 Size=32
 Context=Devices
@@ -184,6 +196,10 @@ Type=Threshold
 Size=48
 Context=Applications
 Type=Threshold
+[48x48/categories]
+Size=48
+Context=Categories
+Type=Threshold
 [48x48/devices]
 Size=48
 Context=Devices
@@ -204,6 +220,10 @@ Type=Threshold
 Size=64
 Context=Applications
 Type=Threshold
+[64x64/categories]
+Size=64
+Context=Categories
+Type=Threshold
 [64x64/devices]
 Size=64
 Context=Devices
@@ -224,6 +244,10 @@ Type=Threshold
 Size=128
 Context=Applications
 Type=Threshold
+[128x128/categories]
+Size=128
+Context=Categories
+Type=Threshold
 [128x128/devices]
 Size=128
 Context=Devices