CLI Args extension and file management fix

- added cli param to change threads used by server
- added cli param hide html header and/or footer
- added cli param to remove css styling
- added cli param to set http basic auth username and optionally password for the server
- file pastas now delete the files from the disk as well when they expire

templates/footer.html

@@ -1,7 +1,13 @@
+
+{% if !args.hide_footer %}
+
 <hr>
 <p style="font-size: smaller">
     MicroBin by Daniel Szabo. Fork me on <a href="https://github.com/szabodanika/microbin">GitHub</a>!
     Let's keep the Web <b>compact</b>, <b>accessible</b> and <b>humane</b>!
 </p>
+
+{%- endif %}
+
 </body>
 </html>