Update Icons

Subdivided the new icons in 3 size categories. As requested by UX
Used the company naming scheme for uniformity and easy recognition.

Known issues:
- Top/Bottom category wasn't taken into account by UX at the time. Since
 this is a recent addition. Both the Walls and Top/Bottom will be updated.
- Cloud/Network connection icons 12px don't render correctly. Due to the
 theme-ing.
- Extruder Icons do not render correctly.

CURA-8010_new_icons

resources/qml/Preferences/Materials/MaterialsBrandSection.qml

@@ -66,7 +66,7 @@ Item
                 width: UM.Theme.getSize("standard_arrow").width
                 height: UM.Theme.getSize("standard_arrow").height
                 color: "black"
-                source: brand_section.expanded ? UM.Theme.getIcon("arrow_bottom") : UM.Theme.getIcon("arrow_left")
+                source: brand_section.expanded ? UM.Theme.getIcon("ChevronSingleDown") : UM.Theme.getIcon("ChevronSingleLeft")
             }
         }
     }
@@ -144,4 +144,4 @@ Item
             expanded = materialList.expandedBrands.indexOf(sectionName) > -1
         }
     }
-}
+}

resources/qml/Preferences/Materials/MaterialsSlot.qml

@@ -122,7 +122,7 @@ Rectangle
                     }
                 }
             }
-            source: materialSlot.is_favorite ? UM.Theme.getIcon("favorites_star_full") : UM.Theme.getIcon("favorites_star_empty")
+            source: materialSlot.is_favorite ? UM.Theme.getIcon("StarFilled") : UM.Theme.getIcon("Star")
         }
     }
-}
+}

resources/qml/Preferences/Materials/MaterialsTypeSection.qml

@@ -78,7 +78,7 @@ Item
                 width: UM.Theme.getSize("standard_arrow").width
                 height: UM.Theme.getSize("standard_arrow").height
                 color: "black"
-                source: material_type_section.expanded ? UM.Theme.getIcon("arrow_bottom") : UM.Theme.getIcon("arrow_left")
+                source: material_type_section.expanded ? UM.Theme.getIcon("ChevronSingleDown") : UM.Theme.getIcon("ChevronSingleLeft")
             }
 
         }
@@ -134,4 +134,4 @@ Item
             expanded = materialList.expandedTypes.indexOf(materialBrand + "_" + materialName) > -1
         }
     }
-}
+}