Shift+Arrow Key support for st [mc]

This patch adds support for the simple term
(st.suckless.org) to midnight commander.

Index: misc/mc.lib
--- misc/mc.lib.orig
+++ misc/mc.lib
@@ -146,6 +146,22 @@ copy=xterm
 [terminal:tmux-256color]
 copy=xterm
 
+[terminal:st]
+shift-right=\\e[1\;5C
+shift-left=\\e[1\;5D
+shift-up=\\e[1\;2A
+shift-down=\\e[1\;2B
+alt-shift-right=\\e[1\;6C
+alt-shift-left=\\e[1\;6D
+alt-shift-up=\\e[1\;6A
+alt-shift-down=\\e[1\;6B
+
+[terminal:st-256color]
+copy=st
+
+[terminal:st-git-256color]
+copy=st
+
 [terminal:ibmpc3]
 f11=\\e[Y
 f12=\\e[Z