Changed out legacy (and outdated) Mocha UI slider for more modern HTML5 <input type="range"> to fix qbittorrent/qBittorrent#1036 ; This is not globally supported and therefore I've also mimiced the qBittorrent's desktop UI and added a generic input which is always available. This also allows the setting to be placed outside the range of the <input type="range">(fix qbittorrent/qBittorrent#43)