Mimicks vlc-android architecture

Jenkins has only android-17 build tools installed.

SipCall keeps track of its security state, and store its SAS if needed.
This commit also introduce two new Fragments wrappers, for accounts and calls.
These wrappers reduce code duplication between fragments requiring hooks on daemon
signals.

Modified AccountSelectionButton to Spinner
Modified build instructions
Added make-glue.sh to generate interfaces (using dbusxx)

includes: libexpat libyaml libdbus-c++ commoncpp ccrtp
          libdbus (from android-4.0.4 sources)

TODO:
- git ignores "/jni/sflphone", sflphone repo should be cloned.
- sflphone-android only needs daemon directory. Ideally it should be possible
to clone it without cloning the whole sflphone project.
into sfl-android (commit 6a0fa7a "#13961: Fix cipher handling" has been used here)
- add pjsip-android project as a git submodule
- sflphone-android needs pjsip android project. Ideally daemon git repository
should not embed pjsip. Instead pjsip should be clone from official repositories.

Considering this, structure should have three distincts git repos:

sflphone-android/.git
sflphone-android/jni/ccrtp-1.8.0-android
sflphone-android/jni/commoncpp2-1.8.1-android
sflphone-android/jni/dbus
sflphone-android/jni/libdbus-c++-0.9.0-android
sflphone-android/jni/libexpat
sflphone-android/jni/libyaml

sflphone-android/jni/sflphone-daemon/.git
sflphone-android/jni/sflphone-daemon/src/audio
sflphone-android/jni/sflphone-daemon/src/config
sflphone-android/jni/sflphone-daemon/src/dbus
sflphone-android/jni/sflphone-daemon/src/history
sflphone-android/jni/sflphone-daemon/src/hooks
sflphone-android/jni/sflphone-daemon/src/iax
sflphone-android/jni/sflphone-daemon/src/sip
sflphone-android/jni/sflphone-daemon/src/video

sflphone-android/jni/pjsip-android/.git

Signed-off-by: Emeric Vigier <emeric.vigier@savoirfairelinux.com>