Restructure project directories (#333)

`/client/web` -> `/frontend`
`/client/cli` -> *delete for now*
`/client/native` -> *delete for now*
`/core/editor` -> `/editor`
`/core/document` -> `/graphene`
`/core/renderer` -> `/charcoal`
`/core/proc-macro` -> `/proc-macros` *(now plural)*

editor/src/misc/test_utils.rs

@@ -0,0 +1,85 @@
+use crate::{
+	input::{
+		mouse::{MouseKeys, MouseState, ScrollDelta},
+		InputPreprocessorMessage, ModifierKeys,
+	},
+	message_prelude::{Message, ToolMessage},
+	tool::ToolType,
+	Editor,
+};
+use graphene::color::Color;
+
+/// A set of utility functions to make the writing of editor test more declarative
+pub trait EditorTestUtils {
+	fn draw_rect(&mut self, x1: u32, y1: u32, x2: u32, y2: u32);
+	fn draw_shape(&mut self, x1: u32, y1: u32, x2: u32, y2: u32);
+	fn draw_ellipse(&mut self, x1: u32, y1: u32, x2: u32, y2: u32);
+
+	/// Select given tool and drag it from (x1, y1) to (x2, y2)
+	fn drag_tool(&mut self, typ: ToolType, x1: u32, y1: u32, x2: u32, y2: u32);
+	fn move_mouse(&mut self, x: u32, y: u32);
+	fn mousedown(&mut self, state: MouseState);
+	fn mouseup(&mut self, state: MouseState);
+	fn lmb_mousedown(&mut self, x: u32, y: u32);
+	fn input(&mut self, message: InputPreprocessorMessage);
+	fn select_tool(&mut self, typ: ToolType);
+	fn select_primary_color(&mut self, color: Color);
+}
+
+impl EditorTestUtils for Editor {
+	fn draw_rect(&mut self, x1: u32, y1: u32, x2: u32, y2: u32) {
+		self.drag_tool(ToolType::Rectangle, x1, y1, x2, y2);
+	}
+
+	fn draw_shape(&mut self, x1: u32, y1: u32, x2: u32, y2: u32) {
+		self.drag_tool(ToolType::Shape, x1, y1, x2, y2);
+	}
+
+	fn draw_ellipse(&mut self, x1: u32, y1: u32, x2: u32, y2: u32) {
+		self.drag_tool(ToolType::Ellipse, x1, y1, x2, y2);
+	}
+
+	fn drag_tool(&mut self, typ: ToolType, x1: u32, y1: u32, x2: u32, y2: u32) {
+		self.select_tool(typ);
+		self.move_mouse(x1, y1);
+		self.lmb_mousedown(x1, y1);
+		self.move_mouse(x2, y2);
+		self.mouseup(MouseState {
+			position: (x2, y2).into(),
+			mouse_keys: MouseKeys::empty(),
+			scroll_delta: ScrollDelta::default(),
+		});
+	}
+
+	fn move_mouse(&mut self, x: u32, y: u32) {
+		self.input(InputPreprocessorMessage::MouseMove((x, y).into(), ModifierKeys::default()));
+	}
+
+	fn mousedown(&mut self, state: MouseState) {
+		self.input(InputPreprocessorMessage::MouseDown(state, ModifierKeys::default()));
+	}
+
+	fn mouseup(&mut self, state: MouseState) {
+		self.handle_message(InputPreprocessorMessage::MouseUp(state, ModifierKeys::default())).unwrap()
+	}
+
+	fn lmb_mousedown(&mut self, x: u32, y: u32) {
+		self.mousedown(MouseState {
+			position: (x, y).into(),
+			mouse_keys: MouseKeys::LEFT,
+			scroll_delta: ScrollDelta::default(),
+		})
+	}
+
+	fn input(&mut self, message: InputPreprocessorMessage) {
+		self.handle_message(Message::InputPreprocessor(message)).unwrap();
+	}
+
+	fn select_tool(&mut self, typ: ToolType) {
+		self.handle_message(Message::Tool(ToolMessage::SelectTool(typ))).unwrap();
+	}
+
+	fn select_primary_color(&mut self, color: Color) {
+		self.handle_message(Message::Tool(ToolMessage::SelectPrimaryColor(color))).unwrap();
+	}
+}