Dialogs/TrafficList: make the ActionListener mandatory

We'll need it soon.
Dialogs/TrafficList: add "Map" button
MapItem: move to MapWindow/Items/
MapItem: include cleanup
MapItem: don't include ObservationZonePoint.hpp

Move ~TaskOZMapItem() to MapItem.cpp.
MapItem: don't include FLARM/Traffic.hpp

Pass FlarmId instead of FlarmTraffic to TrafficMapItem().  Reduces
header dependencies.
MapItemListRenderer: use Layout::GetTextPadding()
MapItem: show SkyLines traffic
Manual: Fixed Acroread error by useing a png for the swift logo.
Manual figures: Updates with 6.5 screen-shots.
Manual fr: Two new translated chapters, new and updated screenshots.
Manual fr: Moved translation to svg figures.
Manual fr: Harmonized the menu refernces.
InfoBoxes: Added "Radial" infobox

Implements ticket #2577
Merge remote-tracking branch 'hjr/manual-fr'
DKTJM: improved filter.
BlueFlyVario: faster.
DKTJM: kiwi polar for 390 kg.
Terrain/Intersection: remove option ACCURATE_TERRAIN_INTERSECTION

Disabling this seems useless.
Terrain/Intersection: GetFieldDirect() returns std::pair

Return the height and a bool flag specifying whether this was found in
the a real tile or in the overview.  Replaces the old reference
parameter "tile_index" which has been broken since 5a771d.