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/window/title-bar/WindowTitle.vue

@@ -0,0 +1,24 @@
+<template>
+	<div class="window-title">
+		<span>{{ title }}</span>
+	</div>
+</template>
+
+<style lang="scss">
+.window-title {
+	display: flex;
+	align-items: center;
+	white-space: nowrap;
+	padding: 0 8px;
+}
+</style>
+
+<script lang="ts">
+import { defineComponent } from "vue";
+
+export default defineComponent({
+	props: {
+		title: { type: String, required: true },
+	},
+});
+</script>