[script] Add simple due script for bibtex file

Scrapes a bibtex file for 'due' field, and outputs all found entries
with their priority and sorted for date.

rofi/.config/rofi/themes/dropdown.rasi

@@ -0,0 +1,17 @@
+
+/**
+ * This theme is intended for a full-width dropdown. It will dynamically resize, depending on the amount of list items.
+ */
+
+@import "./layouts/list-vertical-dynamic.rasi"
+
+#window {
+  width: 100%;
+  location:north;
+  anchor:north;
+}
+
+#listview {
+dynamic: true;
+fixed-height: false;
+}

rofi/.config/rofi/themes/layouts/list-vertical-dynamic.rasi

@@ -0,0 +1,18 @@
+/**
+ * This theme is intended for a normal vertical list, which can fill the width of the screen.
+ */
+
+@import "../settings.rasi"
+
+#window {
+	padding: 5;
+}
+
+#listview {
+layout: vertical;
+spacing: @option-5-listview-spacing;
+}
+
+#element {
+  padding: 10;
+}