added webp image import extension

extensions/fablabchemnitz/webp_import/meta.json

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+[
+  {
+    "name": "WebP Import",
+    "id": "fablabchemnitz.de.webp_import",
+    "path": "webp_import",
+    "original_name": "WebP Import",
+    "original_id": "fablabchemnitz.de.webp_import",
+    "license": "GNU GPL v3",
+    "license_url": "https://gitea.fablabchemnitz.de/FabLab_Chemnitz/mightyscape-1.X/src/branch/master/LICENSE",
+    "comment": "Written by Mario Voigt",
+    "source_url": "https://gitea.fablabchemnitz.de/FabLab_Chemnitz/mightyscape-1.X/src/branch/master/extensions/fablabchemnitz/webp_import",
+    "fork_url": null,
+    "documentation_url": "https://stadtfabrikanten.org/display/IFM/WebP+Import",
+    "inkscape_gallery_url": null,
+    "main_authors": [
+      "inkscape.org/mono",
+      "github.com/vmario89"
+    ]
+  }
+]

extensions/fablabchemnitz/webp_import/person.xml

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+<QuoteWerksXML><AppVersionMajor>5.1</AppVersionMajor></QuoteWerksXML>

extensions/fablabchemnitz/webp_import/webp_import.inx

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+<?xml version="1.0" encoding="UTF-8"?>
+<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
+	<name>WebP Import</name>
+	<id>fablabchemnitz.de.webp_import</id>
+	<input>
+		<extension>.webp</extension>
+		<mimetype>image/webp</mimetype>
+		<filetypename>WebP Format (*.webp)</filetypename>
+		<filetypetooltip>Import WebP Format</filetypetooltip>
+	</input>
+	<script>
+		<command location="inx" interpreter="python">webp_import.py</command>
+	</script>
+</inkscape-extension>

extensions/fablabchemnitz/webp_import/webp_import.py

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+#!/usr/bin/env python3
+
+import sys
+import os
+import argparse
+import inkex
+from inkex import Rectangle
+from PIL import Image
+import base64
+from io import BytesIO, StringIO
+from distutils.spawn import find_executable
+import subprocess
+from lxml import etree
+
+class WebpImport(inkex.InputExtension):
+    
+    def add_arguments(self, pars):
+        pars.add_argument('inputfile')
+        
+    def effect(self):
+        if os.name == 'nt':
+            tmp =  os.getenv('TEMP') + '\\'
+        else:
+            tmp = '/tmp/'
+        convertfile = os.path.join(tmp, "webp.png")
+        if find_executable('magick'):
+            command = "magick \"%s\" \"%s\" " % (self.options.inputfile, convertfile)
+        elif find_executable('convert'):
+            command = "convert \"%s\" \"%s\" " % (self.options.inputfile, convertfile)
+        else:
+            inkex.errormsg('ImageMagick does not appear to be installed.')
+            exit()   
+        p = subprocess.Popen(command, shell=True)
+        return_code = p.wait()
+        #inkex.utils.debug("command:" + command)
+        #inkex.utils.debug("Errorcode:" + str(return_code))
+        
+        try:
+            img = Image.open(convertfile)
+        except Image.DecompressionBombError as e: #we could also increse PIL.Image.MAX_IMAGE_PIXELS = some large int
+            self.msg("Error. Image is too large. Reduce DPI and try again!")
+            exit(1)
+        output_buffer = BytesIO()
+        img.save(output_buffer, format='PNG')
+        width, height = img.size
+        byte_data = output_buffer.getvalue()
+        base64_str = base64.b64encode(byte_data).decode('UTF-8')
+        webp = etree.SubElement(Rectangle(), '{http://www.w3.org/2000/svg}image')
+        webp.attrib['x'] = str(0)
+        webp.attrib['y'] = str(0)
+        webp.attrib['width'] = str(width)
+        webp.attrib['height'] = str(height)
+        webp.attrib['{http://www.w3.org/1999/xlink}href'] = "data:image/png;base64,{}".format(base64_str)
+        base = ('<svg xmlns="http://www.w3.org/2000/svg"'
+                ' width="{}px" height="{}px" viewBox="{} {} {} {}"/>'
+               ).format(width, height, 0, 0, width, height)
+        output = StringIO(base)
+        tree = etree.parse(output)
+        output.close()
+        tree.getroot().append(webp)
+        svgfile = os.path.join(tmp, "webp.svg")
+        with open(svgfile, 'w') as file:
+            tree.write(svgfile)
+        with open(svgfile, 'r') as newfile:
+            sys.stdout.write(newfile.read())
+
+    def load(self, stream):
+        return str(stream.read())
+
+if __name__ == '__main__':
+    WebpImport().run()
+