v3.3 - Update Readme, fix cleanup bug, flip button CSS.

-v3.3.
-Update README.md.
  -Remove mention of Docker repo, as it is not maintained.
  -I appreciate all of the community feedback at #46.
  -I will come up with an official Docker solution.
-Fix bug in cleanFiles() function that was causing problems with archive conversions & preventing cleanup.
-Flip button CSS, so buttons don't appear quite so... upside-down... all the time.
-Remove un-needed (redundant) button related CSS from HRConvert2.css.
-Increase default DeleteThreshold in config.php from 30 to 60 minutes.
-Remove un-needed extension being passed to the convertDrawings() function.
-Fix drawings not returning a valid filename.
  -Conversions would complete, but not download.
-Tested ImageMagick support for SVG, could not get it to work.
-Tested Dia support for converting things into PNG, BMP, and JPG. Got PNG to work, so added support.

v3.1 - ScanCore to v0.9, PHP-AV v4.1.

-v3.1.
-ScanCore to v0.9, PHP-AV v4.1.
-Correct logging location, remove erroneous log directory created alongside ScanCore.
-Improve argument handling.
-Add $AllowStreams config entry to selectivly disable stream formats.

v2.9.2 - Finish adding latest core features to langauge packs.

Delete jquery-3.1.0.min.js

v2.6 - Improve sanitization per Issue #4

-v2.6.
-Improve sanitization per Issue #4.
-Github user @robre pointed out some typos in sanitizeCore.php, specifically lines 95 & line 96 from v2.4.
-These bugs mean to me that I need to review more of this code.
-Thank you, @robre!

v2.4 - Improve sanitization.

-v2.4.
-Improve sanitization.
-Based on input from neogeovr on Reddit.

Add files via upload