Move android build to ndk r20 and Qt 5.12.4

Updates for Qt 5.12 and 64 bit

64 bit serial fixes

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

qobject_cast is times faster then dynamic_cast for objects
that inherit QObject. also, use auto keyword to not repeat
the class name

qobject_cast is times faster then dynamic_cast for objects that
inherit QObject. Also, use auto keyword to not duplicate the
name of the Class

Use QHostAddress(string) instead

Return a empty QString instead

This helps with other IDE's that handle CMake better than QMake

This feels like a hack - they are already inserted somehwere else
in the plugin folder.

Create a new Target FactControls, and add a custom target for the
Qml in the folder.

This creates a fake target that adds the Qml sources to the CMakeProject
this let's IDE's that read CMake files to display the files on the
project viewer

This creates a fake target that adds the Qml sources to the CMakeProject
this let's IDE's that read CMake files to display the files on the
project viewer

* CMake: Set warning level and disable -Waddress-of-packet-member

Mavlink fails terribly on the check for -Waddress-of-packet-member
but this is not a problem of QGC, if I don't remove this warning
it's impossible to look at the terminal for QGC warnings.
This needs to be fixed however, but this is not the place.

Fixes build

Log replay: Support changing speed of playback