Implement the Text Tool and text layer MVP (#492)

* Add text tool

* Double click with the select tool to edit text

* Fix (I think?) transitioning to select tool

* Commit and abort text editing

* Transition to a contenteditable div and autosize

* Fix right click blocking

* Cleanup hints

* Ctrl + enter leaves text edit mode

* Render indervidual bounding boxes for text

* Re-format space indents

* Reflect font size in the textarea

* Fix change tool behaviour

* Remove starting text

* Populate the cache (caused doc load bug)

* Remove console log

* Chrome display the flashing text entry cursor

* Update overlay on input

* Cleanup input.ts

* Fix bounding boxes

* Apply review feedback

* Remove manual test

* Remove svg from gitignore

Co-authored-by: Keavon Chambers <keavon@keavon.com>

graphene/src/operation.rs

@@ -45,6 +45,22 @@ pub enum Operation {
 		transform: [f64; 6],
 		style: style::PathStyle,
 	},
+	AddText {
+		path: Vec<LayerId>,
+		transform: [f64; 6],
+		insert_index: isize,
+		text: String,
+		style: style::PathStyle,
+		size: f64,
+	},
+	SetTextEditability {
+		path: Vec<LayerId>,
+		editable: bool,
+	},
+	SetTextContent {
+		path: Vec<LayerId>,
+		new_text: String,
+	},
 	AddPolyline {
 		path: Vec<LayerId>,
 		transform: [f64; 6],