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/widgets/buttons/IconButton.vue

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+<template>
+	<button class="icon-button" :class="`size-${String(size)}`" @click="action">
+		<IconLabel :icon="icon" />
+	</button>
+</template>
+
+<style lang="scss">
+.icon-button {
+	display: inline-flex;
+	justify-content: center;
+	align-items: center;
+	flex: 0 0 auto;
+	padding: 0;
+	outline: none;
+	border: none;
+	border-radius: 2px;
+	background: none;
+	vertical-align: top;
+	fill: var(--color-e-nearwhite);
+
+	// The `where` pseduo-class does not contribtue to specificity
+	& + :where(.icon-button) {
+		margin-left: 0;
+	}
+
+	&:hover {
+		background: var(--color-6-lowergray);
+		color: var(--color-f-white);
+		fill: var(--color-f-white);
+	}
+
+	&.size-12 {
+		width: 12px;
+		height: 12px;
+	}
+
+	&.size-16 {
+		width: 16px;
+		height: 16px;
+	}
+
+	&.size-24 {
+		width: 24px;
+		height: 24px;
+	}
+
+	&.size-32 {
+		width: 32px;
+		height: 32px;
+	}
+}
+</style>
+
+<script lang="ts">
+import { defineComponent } from "vue";
+import IconLabel from "@/components/widgets/labels/IconLabel.vue";
+
+export default defineComponent({
+	props: {
+		action: { type: Function, required: true },
+		icon: { type: String, required: true },
+		size: { type: Number, required: true },
+		gapAfter: { type: Boolean, default: false },
+	},
+	components: { IconLabel },
+});
+</script>

frontend/src/components/widgets/buttons/PopoverButton.vue

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+<template>
+	<div class="popover-button">
+		<IconButton :action="handleClick" :icon="icon" :size="16" data-hover-menu-spawner />
+		<FloatingMenu :type="MenuType.Popover" :direction="MenuDirection.Bottom" ref="floatingMenu">
+			<slot></slot>
+		</FloatingMenu>
+	</div>
+</template>
+
+<style lang="scss">
+.popover-button {
+	display: inline-block;
+	position: relative;
+	width: 16px;
+	height: 24px;
+	flex: 0 0 auto;
+
+	.floating-menu {
+		left: 50%;
+	}
+
+	.icon-button {
+		width: 100%;
+		height: 100%;
+		padding: 0;
+		outline: none;
+		border: none;
+		border-radius: 2px;
+		vertical-align: top;
+		background: var(--color-1-nearblack);
+		fill: var(--color-e-nearwhite);
+
+		&:hover {
+			background: var(--color-6-lowergray);
+			fill: var(--color-f-white);
+		}
+	}
+
+	// TODO: Refactor this and other complicated cases dealing with joined widget margins and border-radius by adding a single standard set of classes: joined-first, joined-inner, and joined-last
+	div[class*="-input"] + & {
+		margin-left: 1px;
+
+		.icon-button {
+			border-radius: 0 2px 2px 0;
+		}
+	}
+}
+</style>
+
+<script lang="ts">
+import { defineComponent } from "vue";
+import IconButton from "@/components/widgets/buttons/IconButton.vue";
+import FloatingMenu, { MenuDirection, MenuType } from "@/components/widgets/floating-menus/FloatingMenu.vue";
+
+export enum PopoverButtonIcon {
+	"DropdownArrow" = "DropdownArrow",
+	"VerticalEllipsis" = "VerticalEllipsis",
+}
+
+export default defineComponent({
+	components: {
+		FloatingMenu,
+		IconButton,
+	},
+	props: {
+		action: { type: Function, required: false },
+		icon: { type: String, default: PopoverButtonIcon.DropdownArrow },
+	},
+	methods: {
+		handleClick() {
+			(this.$refs.floatingMenu as typeof FloatingMenu).setOpen();
+
+			if (this.action) this.action();
+		},
+	},
+	data() {
+		return {
+			MenuDirection,
+			MenuType,
+		};
+	},
+});
+</script>

frontend/src/components/widgets/buttons/TextButton.vue

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+<template>
+	<button class="text-button" :class="{ emphasized, disabled }" :style="minWidth > 0 ? `min-width: ${minWidth}px` : ''" @click="action">
+		<TextLabel>{{ label }}</TextLabel>
+	</button>
+</template>
+
+<style lang="scss">
+.text-button {
+	display: inline-flex;
+	justify-content: center;
+	align-items: center;
+	flex: 0 0 auto;
+	height: 24px;
+	padding: 0 8px;
+	box-sizing: border-box;
+	outline: none;
+	border: none;
+	border-radius: 2px;
+	background: var(--color-5-dullgray);
+	color: var(--color-e-nearwhite);
+
+	&:hover {
+		background: var(--color-6-lowergray);
+		color: var(--color-f-white);
+	}
+
+	&.emphasized {
+		background: var(--color-accent);
+		color: var(--color-f-white);
+
+		&:hover {
+			background: var(--color-accent-hover);
+		}
+
+		&.disabled {
+			background: var(--color-accent-disabled);
+		}
+	}
+
+	&.disabled {
+		background: var(--color-4-dimgray);
+		color: var(--color-8-uppergray);
+	}
+
+	& + .text-button {
+		margin-left: 8px;
+	}
+}
+</style>
+
+<script lang="ts">
+import { defineComponent } from "vue";
+import TextLabel from "@/components/widgets/labels/TextLabel.vue";
+
+export default defineComponent({
+	props: {
+		action: { type: Function, required: true },
+		label: { type: String, required: true },
+		emphasized: { type: Boolean, default: false },
+		disabled: { type: Boolean, default: false },
+		minWidth: { type: Number, default: 0 },
+		gapAfter: { type: Boolean, default: false },
+	},
+	components: { TextLabel },
+});
+</script>