Massively reorganize and clean up the whole Rust codebase (#478)

* Massively reorganize and clean up the whole Rust codebase

* Additional changes during code review

editor/src/viewport_tools/tool_options.rs

@@ -0,0 +1,40 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Serialize, Deserialize, Hash)]
+pub enum ToolOptions {
+	Select { append_mode: SelectAppendMode },
+	Crop {},
+	Navigate {},
+	Eyedropper {},
+	Text {},
+	Fill {},
+	Gradient {},
+	Brush {},
+	Heal {},
+	Clone {},
+	Patch {},
+	BlurSharpen {},
+	Relight {},
+	Path {},
+	Pen { weight: u32 },
+	Freehand {},
+	Spline {},
+	Line { weight: u32 },
+	Rectangle {},
+	Ellipse {},
+	Shape { shape_type: ShapeType },
+}
+
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Serialize, Deserialize, Hash)]
+pub enum SelectAppendMode {
+	New,
+	Add,
+	Subtract,
+	Intersect,
+}
+
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Serialize, Deserialize, Hash)]
+pub enum ShapeType {
+	Star { vertices: u32 },
+	Polygon { vertices: u32 },
+}