This allows for multiple filters to be applied simultaneously. This commit
also moves some misc stuff, like the help and donate buttons, into a new
info menu. This also fixes touches outside of a popout menu not causing
the menu to close.

Also fix missing metadata on Sholstim and Citra

Inkscape now exits before it finishes writing its files, somehow.
So, we need to wait for the files to be created. The Blender
add-on also now correctly configures the lineart to use the
secondary camera, which is rotated to avoid errors when rendering
orthographically.

Also update the add-on to allow for configuration of
potrace's alpha settings, which controls how strongly
it favors straight lines. This makes things like buildings
look a lot nicer.