Multi-document management (create new document; tab switching) (#210)

* Multi-docs WIP

* Change to number

* Add new document and switch documents

* Remove keybind for previous document. Change keybind for next document.

* Switch documents by clicking tabs

* Remove keybind for previous document. Change keybind for next document.

* multi-docs

* Update package-lock.json

* Hook up File>New to add new document

* Remove console logs and empty lines. Start new documents from 2 instead of 1.

* Fix formatting

core/editor/src/input/input_mapper.rs

@@ -161,6 +161,8 @@ impl Default for Mapping {
 			entry! {action=DocumentMessage::DeleteSelectedLayers, key_down=KeyBackspace},
 			entry! {action=DocumentMessage::ExportDocument, key_down=KeyS, modifiers=[KeyControl, KeyShift]},
 			entry! {action=DocumentMessage::ExportDocument, key_down=KeyE, modifiers=[KeyControl]},
+			entry! {action=DocumentMessage::NewDocument, key_down=KeyN, modifiers=[KeyShift]},
+			entry! {action=DocumentMessage::NextDocument, key_down=KeyTab, modifiers=[KeyShift]},
 			// Global Actions
 			entry! {action=GlobalMessage::LogInfo, key_down=Key1},
 			entry! {action=GlobalMessage::LogDebug, key_down=Key2},

core/editor/src/input/keyboard.rs

@@ -59,6 +59,7 @@ pub enum Key {
 	KeyBackspace,
 	KeyAlt,
 	KeyEscape,
+	KeyTab,
 
 	// This has to be the last element in the enum.
 	NumKeys,