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)*

graphene/src/operation.rs

@@ -0,0 +1,134 @@
+use std::{
+	collections::hash_map::DefaultHasher,
+	hash::{Hash, Hasher},
+};
+
+use crate::{
+	color::Color,
+	layers::{style, BlendMode, Layer},
+	LayerId,
+};
+
+use serde::{Deserialize, Serialize};
+
+#[repr(C)]
+#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
+pub enum Operation {
+	AddEllipse {
+		path: Vec<LayerId>,
+		insert_index: isize,
+		transform: [f64; 6],
+		style: style::PathStyle,
+	},
+	AddRect {
+		path: Vec<LayerId>,
+		insert_index: isize,
+		transform: [f64; 6],
+		style: style::PathStyle,
+	},
+	AddBoundingBox {
+		path: Vec<LayerId>,
+		transform: [f64; 6],
+		style: style::PathStyle,
+	},
+	AddLine {
+		path: Vec<LayerId>,
+		insert_index: isize,
+		transform: [f64; 6],
+		style: style::PathStyle,
+	},
+	AddPen {
+		path: Vec<LayerId>,
+		transform: [f64; 6],
+		insert_index: isize,
+		points: Vec<(f64, f64)>,
+		style: style::PathStyle,
+	},
+	AddShape {
+		path: Vec<LayerId>,
+		insert_index: isize,
+		transform: [f64; 6],
+		sides: u8,
+		style: style::PathStyle,
+	},
+	DeleteLayer {
+		path: Vec<LayerId>,
+	},
+	DuplicateLayer {
+		path: Vec<LayerId>,
+	},
+	RenameLayer {
+		path: Vec<LayerId>,
+		name: String,
+	},
+	PasteLayer {
+		layer: Layer,
+		path: Vec<LayerId>,
+		insert_index: isize,
+	},
+	AddFolder {
+		path: Vec<LayerId>,
+	},
+	TransformLayer {
+		path: Vec<LayerId>,
+		transform: [f64; 6],
+	},
+	TransformLayerInViewport {
+		path: Vec<LayerId>,
+		transform: [f64; 6],
+	},
+	SetLayerTransformInViewport {
+		path: Vec<LayerId>,
+		transform: [f64; 6],
+	},
+	TransformLayerInScope {
+		path: Vec<LayerId>,
+		transform: [f64; 6],
+		scope: [f64; 6],
+	},
+	SetLayerTransformInScope {
+		path: Vec<LayerId>,
+		transform: [f64; 6],
+		scope: [f64; 6],
+	},
+	SetLayerTransform {
+		path: Vec<LayerId>,
+		transform: [f64; 6],
+	},
+	ToggleVisibility {
+		path: Vec<LayerId>,
+	},
+	SetLayerBlendMode {
+		path: Vec<LayerId>,
+		blend_mode: BlendMode,
+	},
+	SetLayerOpacity {
+		path: Vec<LayerId>,
+		opacity: f64,
+	},
+	FillLayer {
+		path: Vec<LayerId>,
+		color: Color,
+	},
+}
+
+impl Operation {
+	/// Returns the byte representation of the message.
+	///
+	/// # Safety
+	/// This function reads from uninitialized memory!!!
+	/// Only use if you know what you are doing
+	unsafe fn as_slice(&self) -> &[u8] {
+		core::slice::from_raw_parts(self as *const Operation as *const u8, std::mem::size_of::<Operation>())
+	}
+	/// Returns a pseudo hash that should uniquely identify the operation.
+	/// This is needed because `Hash` is not implemented for f64s
+	///
+	/// # Safety
+	/// This function reads from uninitialized memory but the generated value should be fine.
+	pub fn pseudo_hash(&self) -> u64 {
+		let mut s = DefaultHasher::new();
+		unsafe { self.as_slice() }.hash(&mut s);
+		s.finish()
+	}
+}