Various Random Map Generator Improvements

Registered by Renegade

Improve the Random Map Generator in these ways:
- Enable the Archipelago map type
- Enable random desert maps
- Enable the generation of urban areas and add a checkbox to control it
- Fix snowmd.ini to make urban area generation work on random snow maps
- Disallow paved road curves to be used as road ends

##### ADDITIONAL INFORMATION #####
Split into issues bug:792, bug:793, bug:794, bug:795, bug:796.

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