Allow filling areas using simple line pattern

[Framstag]

Allow to render simple line patterns as area fill (two colors, pen thickness and direction can be configured).

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[Karry]

steps to do:

• extend stylesheet syntax, style definition and parser
• in renderer can be used similar code as for image patterns (in Qt here: MapPainterQt.cpp: 132). Just determine minimum size of pattern rectangle, create image (QImage in Qt backend), draw pattern to it, setup pattern texture for style brush...