shit i want changed for xatspaces

Things to allow:
- multiple classes, e.g. class="box red"
    (yes I know this can be gotten around, but tedious)
- inputs (checkboxes, radios, etc...)
- labels for inputs
- <i>
- <br />

Things to change:
- bbcode for fonts to allow font-size,
    e.g. [font:Lato] includes
        https://fonts.googleapis.com/css?family=Lato,
    ...  [font:Lato:400,900] would include
        https://fonts.googleapis.com/css?family=Lato:400,900