Add the Help > About Graphite dialog with build info

Closes #404

frontend/src/components/widgets/floating-menus/DialogModal.vue

@@ -9,7 +9,7 @@
 				<LayoutCol :class="'main-column'">
 					<TextLabel :bold="true" :class="'heading'">{{ dialog.heading }}</TextLabel>
 					<TextLabel :class="'details'">{{ dialog.details }}</TextLabel>
-					<LayoutRow :class="'buttons-row'">
+					<LayoutRow :class="'buttons-row'" v-if="dialog.buttons.length > 0">
 						<TextButton v-for="(button, index) in dialog.buttons" :key="index" :title="button.tooltip" :action="button.callback" v-bind="button.props" />
 					</LayoutRow>
 				</LayoutCol>
@@ -57,12 +57,14 @@
 
 	.main-column {
 		.heading {
+			user-select: text;
 			white-space: pre-wrap;
 			max-width: 400px;
 			margin-bottom: 4px;
 		}
 
 		.details {
+			user-select: text;
 			white-space: pre-wrap;
 			max-width: 400px;
 		}

frontend/src/components/widgets/inputs/MenuBarInput.vue

@@ -153,14 +153,11 @@ const menuEntries: MenuListEntries = [
 		label: "Help",
 		ref: undefined,
 		children: [
+			[{ label: "About Graphite", action: async () => (await wasm).request_about_graphite_dialog() }],
 			[
 				{ label: "Report a Bug", action: () => window.open("https://github.com/GraphiteEditor/Graphite/issues/new", "_blank") },
 				{ label: "Visit on GitHub", action: () => window.open("https://github.com/GraphiteEditor/Graphite", "_blank") },
 			],
-			[
-				{ label: "Graphite License", action: () => window.open("https://raw.githubusercontent.com/GraphiteEditor/Graphite/master/LICENSE.txt", "_blank") },
-				{ label: "Third-Party Licenses", action: () => window.open("/third-party-licenses.txt", "_blank") },
-			],
 			[{ label: "Debug: Panic (DANGER)", action: async () => (await wasm).intentional_panic() }],
 		],
 	},