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Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>

To appease gtk-doc's struct parser, which chokes on the short name for
the data type.

See https://gitlab.gnome.org/GNOME/gtk-doc/issues/63

This is already self-contained.

aeslib.h and assembling.h don't need access to internal data structures,
so make them include the public fprint.h rather than the internal header
fp_internal.h.

Height is not a good determinant in movement direction, normalized
error is much better. Should fix aes1610 and aes2501 driver issues.

Frame assembling routines are not aes-specific, so move them into a separate file
and add an accessor for peeking a pixel.

Some scanners provide hardware assistance in frame assemling, i.e.
horizontal and vertical offset to previous frame is provided. This
commit improves code to utilise that assistance. Sensors without
hardware assistance will use software algorithm, which was also
improved to do search in horizontal direction.

Move overlap detection and assembling code into aeslib to prevent
code duplication

https://bugs.freedesktop.org/show_bug.cgi?id=57426

aes2501 needs this for state tracking

Dropped -Wextra as it is not that useful.
Set compiler flags to be more like the kernel's.
Set std=gnu99
Fixed some warnings.

All 3 authentec drivers now use a shared image assembly function.

Currently provides register writing functionality only, more common ground
will be moved here soon.