Remove broken self-closing tags from <select>

Obviously I did inhale.
Switch over to cURL for sideloading
Some CSS tweaks
Improve sideloading Bitfeed (still needs a redirect fix though)
Added some code to the end of script.js, and styles necessary for it to look good to style.css, for displaying a list of 'editor' buttons for bb-code to the right of the textarea on BBS and prod pages. This code is based on the 'Pouet bb-codeizer for winnars!' user script but refactored for slightly cleaner code, and formatting that better matches what already exists in script.js. It does not include the automatic 'by line' insertion code and other non-editor-essential code from the user script.
Updated the textarea-finding code to be more specific so it is more assured to only activate for the bbs new post and prod new post forms as not all textareas may be for things accepting bb-code. The code could do a dynamic check for the 'BB Code is allowed here' note, but that would be potentially fragile.
Updated the editor bar buttons for making links. Text that appear to be a URL when using the regular link button but are missing a protocol are 'upgraded' to a link-with-text so the fixed URL ('http://' + text) becomes the argument, and the originally written text is the text content. When using the link-with-text button, since the original text is only used for the URL argument it just prepends 'http://'. Otherwise it works the same as before.