Rework of the sxmo_modemtext with benefit

* Draft files are assigned to each number:

Stored here ".local/share/modem/+33666666666/draft.txt"
We automatically edit this single file, making crash or unexpected
edition issue to leave intact saved draft.

* Simplification of some logics

Having a known draft file instead of using a TEXT var simplify lots
of things

* EDITOR is not run in a subshell

Some editors as kakoune got issues with that. Futhermore, it will be
usefull for some other development as making all menu ssh mode
compatible

* Remove modem check

As we now got draft, why do we care if modem is up or down ?

* Display the contact name instead of it number in the conversation

Or use "Unknown Number (+337798676)"

* Unify display message notif adding possibilities to bypass the
main menu

Signed-off-by: Stacy Harper <contact@stacyharper.net>
Signed-off-by: Maarten van Gompel <proycon@anaproy.nl>

scripts/core/sxmo_appmenu.sh

@@ -307,7 +307,7 @@ programchoicesinit() {
 			number="$(echo "$WMNAME" | sed -e 's|^\"||' -e 's|\"$||' | cut -f1 -d' ')"
 			#sms
 			CHOICES="
-				$icon_msg Reply          ^ 0 ^ sxmo_modemtext.sh $number
+				$icon_msg Reply          ^ 0 ^ sxmo_modemtext.sh sendtextmenu $number
 				$icon_phn Call           ^ 0 ^ sxmo_modemdial.sh $number
 			"
 			WINNAME=sms