[FEATURE]: add base mechanisms for OGR feature style export
Implement ogr style in simple line symbol layer
Add enum to vector file writer describing the type of symbology export
Possibility of choosing symbology export method in export dialog
Fix width of simple line style
Better error handling
Add coordinate transform to symbol layer vector export
ogr feature style for simple marker
Hack to fix line widths (for dxf only?)
Use scale for symbology export (if symbol measures are defined in map units)
Dash dot pattern
Use start / stopRender for renderer in vector symbology export
Feature style for simple fill
Fetch attributes for symbology export
Add custom dash dot pattern to symbol layer utils function
Write pen cap and join style to ogr pen
Write offset into ogr pen style
Ogr style string for line pattern fill
Let ogr give ids to created features (otherwise, there are problems with exported dxf files)
Export ogr feature style in mm for line width and in ground units for line pattern