Zenity-fy this project.

Working with python and the args for this project is rather
clumsy, so I'm adding a zenity wrapper that will aid people
to find the right folders easily and start the conversion
process. This should make it a lot easier to do the conversion
for people.

entities.py

@@ -0,0 +1,22 @@
+from itemstack import *
+#If you wish to add more entities, then...
+# To print out pre and post-conversion entity information uncomment line 237 (ish) in blocks.py (search for 'EntityInfo' to locate it)
+
+def convert_frame(e):
+    from pprint import pprint
+    pprint(e)
+    # must read attribs and translate to entities we know from map_content.txt
+    content = e.get("Item")
+    x = e.get("TileX")
+    y = e.get("TileY")
+    z = e.get("TileZ")
+    item = e.get("Item")
+    if item:
+        content = item.get("id")
+        print(content)
+        return "xdecor:itemframe", None, (None, None)
+    else:
+        print("empty item frame")
+        return "xdecor:itemframe", None, (None, None)
+
+e_convert = {"itemframe": convert_frame}

mcimport.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+# shell wrapper around mcimport.py
+# meant to assist users and provide an easy way to select input and output folders, and
+# assure that the python script runs from the correct location.
+
+cd `dirname $0`
+
+if [ ! -f map_content.txt ]; then
+	zenity --info --text "Unable to locate \"map_content.txt\" file - this is a critical error, and this program is unable to continue."
+	exit 1
+fi
+
+while true; do
+	IN=`cd ~/.minecraft/saves; zenity --file-selection --directory --filename="New World"`
+	if [ "`basename "$IN"`" == "level.dat" ]; then
+		IN="`dirname "$IN"`"
+	fi
+	if [ ! -d "$IN" ]; then
+		zenity --info --text "The chosen entry \"$IN\" is not a folder. Try selecting a folder that has a \"level.dat\" file inside."
+		exit 1
+	fi
+	break
+done
+
+OUT=`zenity --entry --entry-text="$(basename "$IN")" --text="Type the output name of the converted world:"`
+
+if [ -d "${HOME}/.minetest/worlds/$OUT" ]; then
+	if ! `zenity --question --title="Overwrite existing world?" --text="The world \"$OUT\" already exists, do you want to overwrite it?" --default-cancel`; then
+		exit 1
+	fi
+	rm -rf "${HOME}/.minetest/worlds/$OUT"
+fi
+
+zenity --info --width=800 --title="Conversion in progress" --text="The conversion is now running and make take a *very* long time to finish. Do not be alarmed by output lines that show \"Unknown Minecraft Block\" messages, this is normal and can usually be ignored without issues. You can safely close this window." &
+
+python3 mcimport.py "$IN" "${HOME}/.minetest/worlds/$OUT"
+