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)*

frontend/src/components/panels/Properties.vue

@@ -0,0 +1,14 @@
+<template>
+	<div></div>
+</template>
+
+<style lang="scss"></style>
+
+<script lang="ts">
+import { defineComponent } from "vue";
+
+export default defineComponent({
+	components: {},
+	props: {},
+});
+</script>