Dialogs/dlgTarget.xml: Changed caption from Range to Distance.
Set Radial value range for both display orientations to +/-90°
FAISectorRenderer: code import from LK8000

Adapted to the XCSoar APIs (fixed, Angle, GeoPoint, GeoVector, Canvas)
by Max Kellermann.
Gauge/TaskView: optionally render FAI triangle sectors
Android/ProxyAndroidPort: install listener in setPort()

Regression fix for TRAC #2418.
Screen/WindowList: ignore hidden windows for "covered" check

TRAC #2411.
Merge branch 'master' of git://github.com/hjr/XCSoar
Merge branch 'v6.4.x'
GlideComputerAirData: move code to new class AverageVarioComputer
AverageVarioComputer: use DeltaTime
Android release v6.5_preview5
zzip: upgrade to upstream version 0.13.62
Dialogs/XML: include cleanup
Makefile: add missing ZLIB_CPPFLAGS references
Dialogs/XML, Util/ConvertString: add assertions
Makefile: support _CFLAGS_INTERNAL and _CXXFLAGS_INTERNAL
Makefile: fix typo in zlib.a file name
zlib: remove unused sources
zlib: upgrade to upstream version 1.2.7
zlib: disable more unused code
GlideComputerAirData: move code to new class GlideRatioComputer