Filament screen corrected with the following changes:
* Filament bar background colour changed to match theme.
* Filament table background gradient removed.
* Filament bar width adjusted to match files section, this also lined up
the scroll bar with its background.

Addition of a second progress percentage which
is attached to the progress bar div.
CSS set to make this percentage hidden by default.
This will allow the creation of themes where percentage is
visible for both round and straight progress bars.

Theme creates a horizontal progress bar when printing that is more
easily readable from across the room.
This theme requires the additional div from the previous commit,
but the instructions in the Readme.md include a workaround.