This adds vcl::graphic::Manager which is a manager singleton that
tracks all the creation fo graphic objects and swaps them out on
a time and allocation basis.

Time based - every number of seconds it looks for Graphics that
weren't used for a time.

Allocation based - when creating a new Graphic and the total of
Graphic uses more than the total amount of memory for Graphics
defined in configuration, it tries to release the Graphics that
weren't used for a time.

Change-Id: I5dbf74db4a6455d32c4abcbad7be21c7f0534642
Reviewed-on: https://gerrit.libreoffice.org/52396Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>