change background colors and fix mouse cursors
Closes #26 (closed)
this PR (together with psyplot/psy-simple#17 and psyplot/psy-maps#18 fixes disables displaying data if it is not contained by the drawn artist (see #26 (closed)). Furthermore, we add new options for coloring the background, related to the new lsm
options (see psyplot/psy-maps#17).
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Tests passed (for all non-documentation changes)