Refactor notifications work to use 1 interface for writing notifs & use dates

Summary of changes:
1. Always use the sxmo_notificationwrite.sh script to write notifications
   rather then sometimes using echo to the DIR
2. Reorder args for notiffile spec to be action as 1st line, watchfile 2nd, and
   rest as msg; this way msg can be multiple lines without propogating bugs
3. Write calls as a standard notification via sxmo_notificationwrite.sh
4. Use datestamps from notification files instead of filename, this way (3)
   works without extra logic
5. Various style fixes

scripts/core/sxmo_notificationsmenu.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env sh
+NOTIFDIR="$XDG_CONFIG_HOME"/sxmo/notifications
+
+notificationmenu() {
+	CHOICES="Close Menu"
+	for NOTIFFILE in "$NOTIFDIR"/*; do
+		NOTIFMSG="$(tail -n+3 "$NOTIFFILE" | tr "\n^" " ")"
+		NOTIFHRANDMIN="$(stat --printf %y "$NOTIFFILE" | grep -oE '[0-9]{2}:[0-9]{2}')"
+		CHOICES="
+			$CHOICES
+			$NOTIFHRANDMIN - $NOTIFMSG ^ $NOTIFFILE
+		"
+	done
+
+	PICKEDCONTENT="$(
+		printf "%b" "$CHOICES" |
+		xargs -0 echo |
+		sed '/^[[:space:]]*$/d' |
+		awk '{$1=$1};1' |
+		cut -d^ -f1 | 
+		dmenu -c -i -fn "Terminus-18" -p "Notifs" -l 10
+	)"
+
+	[ "$PICKEDCONTENT" = "Close Menu" ] && exit 1
+
+	PICKEDNOTIFFILE="$(echo "$CHOICES" | grep "$PICKEDCONTENT" | cut -d^ -f2 | tr -d ' ')"
+	NOTIFACTION="$(head -n1 "$PICKEDNOTIFFILE")"
+	eval "$NOTIFACTION" &
+	rm "$PICKEDNOTIFFILE"
+}
+
+notificationmenu