Creator now realiable creates one toolchain for each toolchain found in
the ndk. This no longer depends on any qt versions being present.

Also the gdb command and gdb server command are moved to the Kit and are
no longer found in the Android Options page. Both settings can be
autodetected from the Kit options page. Note that this might break
existing android kits.

Change-Id: I1dce084f2bb372e615e19b1c9e3a1e205b5d9647
Reviewed-by: BogDan Vatra <bogdan@kde.org>