rm 'using' from catalogs

GUI/Model/Mask/MaskCatalog.h

@@ -22,8 +22,6 @@ class MaskItem;
 
 class MaskCatalog {
 public:
-    using BaseItem = MaskItem;
-
     // Do not change the numbering! It is serialized!
     enum class Type : uint8_t {
         RegionOfInterest = 0,

GUI/Model/Sample/ParticleCatalog.h

@@ -23,8 +23,6 @@ class MaterialsSet;
 
 class ParticleCatalog {
 public:
-    using BaseItem = ItemWithParticles;
-
     // Do not change the numbering! It is serialized!
     enum class Type : uint8_t { Particle = 1, Composition = 2, CoreShell = 3, Mesocrystal = 4 };
 

GUI/Model/Sim/InstrumentCatalog.h

@@ -22,8 +22,6 @@ class InstrumentItem;
 
 class InstrumentCatalog {
 public:
-    using BaseItem = InstrumentItem;
-
     // Do not change the numbering! It is serialized!
     enum class Type : uint8_t { Scatter2D = 0, Offspec = 1, Specular = 2, Depthprobe = 3 };