tplay: a somewhat functional mpris2 interface (WIP).

--HG--
rename : tplay/src/tizmprisif.cpp => tplay/src/mpris/tizmprisif.cpp
rename : tplay/src/tizmprisif.hpp => tplay/src/mpris/tizmprisif.hpp
rename : tplay/src/tizmprismgr.cpp => tplay/src/mpris/tizmprismgr.cpp
rename : tplay/src/tizmprismgr.hpp => tplay/src/mpris/tizmprismgr.hpp
rename : tplay/src/tizmprisprops.cpp => tplay/src/mpris/tizmprisprops.cpp
rename : tplay/src/tizmprisprops.hpp => tplay/src/mpris/tizmprisprops.hpp