Icon unification. Use preset icons of `generator:source=*` also for mappaint (before there was always the icon for `power=generator` displayed). Drop support of power_source in mappaint.

git-svn-id: https://josm.openstreetmap.de/svn/trunk@7728 0c6e7542-c601-0410-84e7-c038aed88b3b
New unified icon for golf

git-svn-id: https://josm.openstreetmap.de/svn/trunk@7729 0c6e7542-c601-0410-84e7-c038aed88b3b
see #10701 - automatic download of changeset discussion comments + change font

git-svn-id: https://josm.openstreetmap.de/svn/trunk@7730 0c6e7542-c601-0410-84e7-c038aed88b3b
see #10684 - fix javadoc

git-svn-id: https://josm.openstreetmap.de/svn/trunk@7731 0c6e7542-c601-0410-84e7-c038aed88b3b