Fix import

* Add options page to import/export (export also possible from popup)
* Change popup import to open options
* Add separate store.js file for common code between popup and options
* Bump version to 1.5.0

options.css

@@ -0,0 +1,96 @@
+@media (prefers-color-scheme: dark) {
+	:root {
+		--bg-color: hsl(213, 10%, 17%);
+		--light-bg-color: hsl(213, 10%, 23%);
+		--highlight-bg-color: hsl(213, 10%, 28%);
+		--fg-color: #ccc;
+		--border-color: #888;
+		--error-bg-color: hsl(0, 38%, 30%);
+		--img-filter: ;
+	}
+}
+
+@media (prefers-color-scheme: light) {
+	:root {
+		--bg-color: #eee;
+		--light-bg-color: #ddd;
+		--highlight-bg-color: #ccc;
+		--fg-color: #666;
+		--border-color: #888;
+		--error-bg-color: hsl(0, 38%, 70%);
+		--img-filter: invert(1);
+	}
+}
+
+*
+{
+	box-sizing: border-box;
+}
+
+html, body {
+	margin: 0;
+}
+
+body {
+	background-color: var(--bg-color);
+	color: var(--fg-color);
+	padding: 12px;
+	font-size: 16px;
+}
+
+h1 {
+	margin: 0 0 16px 0;
+}
+
+h1 img {
+	height: 1em;
+	margin-right: 16px;
+}
+
+button {
+	background-color: var(--light-bg-color);
+	color: var(--fg-color);
+	border: 1px solid var(--border-color);
+	margin: 4px;
+	cursor: pointer;
+	display: flex;
+	align-items: center;
+	border-radius: 5px;
+	font-size: 1.2rem;
+}
+
+#notification {
+	position: absolute;
+	bottom: 0;
+	z-index: 10;
+	display: flex;
+	flex-direction: row;
+	justify-content: space-between;
+	background-color: var(--error-bg-color);
+	padding: 4px;
+	transform: translateY(100%);
+	transition: transform 0.3s;
+}
+
+#notification.show {
+	transform: translateY(0);
+}
+
+#notification img {
+	height: 1em;
+	cursor: pointer;
+}
+
+#notification-text {
+	white-space: pre-wrap;
+}
+
+.action {
+	display: flex;
+	flex-direction: row;
+}
+
+.action img {
+	height: 1.5em;
+	margin-right: 8px;
+}