Merge pull request #1613 from ramox81/codex/sheet-set-manager

Sheet Set Manager, NEWSHEETSET / OPENSHEETSET and sheet set fields, with review fixes.

# Conflicts:
#	Cargo.lock
#	src/app/control/actions.rs
#	src/app/mod.rs
#	src/app/settings.rs
#	src/app/update/dialog.rs
#	src/app/update/file.rs
#	src/app/update/mod.rs
#	src/app/view/mod.rs
#	src/ui/dock.rs
#	src/ui/ribbon/mod.rs
#	src/ui/window/field_dialog.rs
#	src/ui/window/mod.rs

src/ui/dock.rs

@@ -50,6 +50,8 @@ pub enum PanelId {
     PointCloudManager,
     /// Block counts (COUNTLIST).
     Count,
+    /// The open sheet sets: subsets and sheets.
+    SheetSetManager,
 }
 
 impl PanelId {
@@ -63,6 +65,7 @@ impl PanelId {
             PanelId::NodeGraph => "Node Graph",
             PanelId::PointCloudManager => "Point Cloud Manager",
             PanelId::Count => "Count",
+            PanelId::SheetSetManager => "Sheet Set Manager",
         }
     }
 
@@ -76,6 +79,7 @@ impl PanelId {
             PanelId::NodeGraph => 220.0,
             PanelId::PointCloudManager => 280.0,
             PanelId::Count => 280.0,
+            PanelId::SheetSetManager => 280.0,
         }
     }
 
@@ -167,6 +171,7 @@ impl DockState {
             PanelId::NodeGraph,
             PanelId::PointCloudManager,
             PanelId::Count,
+            PanelId::SheetSetManager,
         ] {
             self.panels.entry(id).or_insert_with(|| DockPanel::for_id(id));
         }