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/ActionPanel/OutputProcessWidget.qml

@@ -57,7 +57,7 @@ Column
                 width: parent.width
 
                 text: preSlicedData ? catalog.i18nc("@label", "No time estimation available") : PrintInformation.currentPrintTime.getDisplayString(UM.DurationFormat.Long)
-                source: UM.Theme.getIcon("clock")
+                source: UM.Theme.getIcon("Clock")
                 font: UM.Theme.getFont("medium_bold")
             }
 
@@ -99,7 +99,7 @@ Column
                     }
                     return totalWeights + "g · " + totalLengths.toFixed(2) + "m"
                 }
-                source: UM.Theme.getIcon("spool")
+                source: UM.Theme.getIcon("Spool")
                 font: UM.Theme.getFont("default")
             }
         }
@@ -142,4 +142,4 @@ Column
             height: UM.Theme.getSize("action_button").height
         }
     }
-}
+}