- code formatting (PSR-2)

- removed all ownCloud references
- removed update.php as its supported version was never published on the app store
- updated info.xml

img/app-dark.svg

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <svg xmlns="http://www.w3.org/2000/svg" height="16" width="16" version="1.0" viewBox="0 0 16 16">
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+    <path style="block-progression:tb;color:#000000;text-transform:none;text-indent:0" fill="#000"
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