Rename demo.sh scripts to try.sh

This is because they are under the try section. I'm aware that there's a
script called try.me.sh but that's not been decided on a name change. It
probably should be changed to try.sh to be consistent and probably will
be but it's not been yet.

The manifest files in tmp/ have been updated as well, including the
macOS Numbers file.

2013/birken/try.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+make clobber everything 2>/dev/null
+
+if [[ -z "$BIRKEN" ]]; then
+    BIRKEN="birken.alt"
+fi
+
+trap "clear; exit" SIGINT
+
+for i in *.txt; do
+    NAME="$(echo "$i" | awk '{ print toupper(substr($1,1,1)) substr($1,2)}'|sed -e 's/\.txt//g' \
+	-e 's/Ioccc/IOCCC/g' -e 's/Mspacman/Ms Pac-Man/g' -e 's/Helloworld/Hello World/g' \
+	-e 's/Cheepcheep/Cheep Cheep/g' -e 's/Happyface/Happy Face/g' -e 's/Paranaplant/Piranha Plant/g' \
+	-e 's/Koopaparatroopa/Koopa Paratroopa/g')"
+    read -r -n1 -p "Press any key to try $NAME: "
+    ./"${BIRKEN}" < "$i"
+    echo
+done
+clear