Added "Forts" to map type selection. This makes the mode easier selectable/discoverable. Also the slider can be used to adjust the distance between forts.

fallback to stdout if no writable logfile available

update Changelog

Set install dir for emscripten While not required, should help compatibility with older cmake versions.

Drop duplicated include from CMakeLists.txt

fix issue #8: Static skull and bones flakes near the water in Sudden Death in themes without flakes

add /clear command to frontend chat (clears chat window)