Updated st to 0.8.2

Updated to latest git (20190414.f1546cf) & updated patches.

Changes:
. Upstream fixes.
. Alpha: Opacity value is now typed in float (0-1).
  Also "-A" cmd option added as alternative opacity changing method.
. Clipboard: middle click pastes from clipboard.
. Organized shortcuts.

.Xdefaults

@@ -1,9 +1,12 @@
-!! Transparency (0-255):
-st.alpha: 240
+!! Transparency (0-1):
+st.alpha: 0.92
 
 !! Set a default font and font size as below:
 st.font: Monospace-11;
 
+! st.termname: st-256color
+! st.borderpx: 2
+
 /* !! gruvbox: */
 /* *.color0: #1d2021 */
 /* *.color1: #cc241d */