[cleanup] Move 41MB XCF file out of the build path

The file is the "source" Gimp image used to create several PNGs for the
documentation, but by being put inside the main "src" folder which is in
the build.properties, it ends up in the final built JAR, where it is
useless and causes the JAR to be much larger than needed.

Move in into a new "assets" folder, designed to contained source
material than can help in producing the documentation, but does not need
to be in the resulting JAR.

Change-Id: I8b8fd2750572fb64fd80e6afed8a0c3fe231ef9c
Cherry-picks: e7e734499911d01c1d76f88f28427dc022f7198a
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>
1 file changed