Shapes marker

Among various changes, the most important here is the support of polygons as markers.
It can easily be added using WKT.

1.1.0

Added the ability to change tile server on the fly

1.0.1

• Add the ability to hide the mouse location label
• Fix a bug causing tiles not painted when the map height is bigger than width

Full Changelog: 1.0.0...1.0.1

1.0.0

Initial release