this is toolkit for PB v 0.3 API may changed until 1.0
included third party libraries:
boost (only for shared_ptr headers from boost-1.76, Boos licence https://www.boost.org/users/license.html) libsigc++-2.4.1 (version that not need c++11, GNU Library General Public License https://www.gnu.org/licenses/lgpl-3.0-standalone.html)
for build you must get pocket-book sdk (currently used fork from https://github.com/blchinezu/pocketbook-sdk)
see make.sh for details