Populate tool shelf and tool options bar (#66)

client/web/src/components/widgets/DropdownButton.vue

@@ -0,0 +1,45 @@
+<template>
+	<button class="dropdown-button">
+		<component :is="icon" />
+	</button>
+</template>
+
+<style lang="scss">
+.dropdown-button {
+	width: 16px;
+	height: 24px;
+	margin: 2px 4px;
+	padding: 0;
+	outline: none;
+	border: none;
+	border-radius: 2px;
+	background: #111;
+	fill: #ddd;
+
+	&:hover {
+		background: #555;
+		fill: #fff;
+	}
+}
+</style>
+
+<script lang="ts">
+import { defineComponent } from "vue";
+import DropdownArrow from "../../../assets/svg/16x24-bounds-8x16-icon/dropdown-arrow.svg";
+import VerticalEllipsis from "../../../assets/svg/16x24-bounds-8x16-icon/vertical-ellipsis.svg";
+
+export enum DropdownButtonIcon {
+	"DropdownArrow" = "DropdownArrow",
+	"VerticalEllipsis" = "VerticalEllipsis",
+}
+
+export default defineComponent({
+	components: {
+		VerticalEllipsis,
+		DropdownArrow,
+	},
+	props: {
+		icon: { type: String, default: DropdownButtonIcon.DropdownArrow },
+	},
+});
+</script>