flake: Add pytec runnables to devShell

Makes it possible to directly run `plot` and `autotune` in the devShell.

flake.nix

@@ -68,6 +68,19 @@
           matplotlib
         ];
       };
+
+      pytec-dev-wrappers = pkgs.runCommandNoCC "pytec-dev-wrappers" { } ''
+        mkdir -p $out/bin
+        for program in ${self}/pytec/*.py; do
+          if [ -x $program ]; then
+            progname=`basename -s .py $program`
+            outname=$out/bin/$progname
+            echo "#!${pkgs.bash}/bin/bash" >> $outname
+            echo "exec python3 -m $progname \"\$@\"" >> $outname
+            chmod 755 $outname
+          fi
+        done
+      '';
     in
     {
       packages.x86_64-linux = {
@@ -89,6 +102,7 @@
             openocd
             dfu-util
             rlwrap
+            pytec-dev-wrappers
           ]
           ++ (with python3Packages; [
             numpy