refactor(icons): replace FontAwesome with Tabler Icons

Drop the three @fortawesome/* packages (v5, with a stagnant Vue 2
binding) in favor of @tabler/icons-webfont. The old <awe-icon>
wrapper is replaced by <vaquant-icon>, named after the project so
future icon-library swaps don't require another rename.

src/utils/icons.ts

@@ -1,82 +1,15 @@
 import Vue from 'vue'
-import { library } from '@fortawesome/fontawesome-svg-core'
-import {
-  faBalanceScale,
-  faBeer,
-  faCheck,
-  faChevronDown,
-  faChevronRight,
-  faCog,
-  faCircle,
-  faClock,
-  faToriiGate,
-  faUtensils,
-  faSubway,
-  faHome,
-  faGift,
-  faDollarSign,
-  faEuroSign,
-  faInbox,
-  faExchangeAlt,
-  faEquals,
-  faGlobeEurope,
-  faMinus,
-  faInfinity,
-  faHandHoldingUsd,
-  faShoppingBasket,
-  faMobile,
-  faMoneyBillWave,
-  faPenSquare,
-  faPlus,
-  faTag,
-  faSignal,
-  faSyncAlt,
-  faUser,
-  faUsers,
-  faUserLock,
-  faTimes,
-  faTheaterMasks,
-  faTrash
-} from '@fortawesome/free-solid-svg-icons'
-import { FontAwesomeIcon } from '@fortawesome/vue-fontawesome'
+import '@tabler/icons-webfont/dist/tabler-icons.min.css'
 
-library.add(
-  faBalanceScale,
-  faBeer,
-  faCheck,
-  faChevronDown,
-  faChevronRight,
-  faCog,
-  faCircle,
-  faClock,
-  faToriiGate,
-  faUtensils,
-  faSubway,
-  faHome,
-  faGift,
-  faDollarSign,
-  faEuroSign,
-  faExchangeAlt,
-  faEquals,
-  faGlobeEurope,
-  faInbox,
-  faMinus,
-  faInfinity,
-  faHandHoldingUsd,
-  faShoppingBasket,
-  faMobile,
-  faMoneyBillWave,
-  faPenSquare,
-  faPlus,
-  faTag,
-  faTrash,
-  faSignal,
-  faSyncAlt,
-  faUser,
-  faUsers,
-  faUserLock,
-  faTimes,
-  faTheaterMasks
-)
-
-Vue.component('awe-icon', FontAwesomeIcon)
+Vue.component('vaquant-icon', {
+  functional: true,
+  props: {
+    icon: { type: String, required: true }
+  },
+  render(h, { props, data }) {
+    return h('i', {
+      ...data,
+      class: [`ti ti-${props.icon}`, data.class, data.staticClass]
+    })
+  }
+})