Added new text fields to upload.php

* Title and description can now be entered for a video on upload.
* Strict filters are in place that will remove HTML tags, special
characters and other stuff from the user input. The filter will be
changed later to ensure special characters can be used.
* Title and description is displayed when the video is successfully
uploaded.
'Unique video serial' assigned to each upload

A unique serial number is generated for each uploaded video. This serial
is generated based on the date the video was uploaded and the title of
the video.