[A-1261] SlackBuilds by Eric Hameleers

cairomm: added v1.8.4 - C++ bindings for cairo (depends on glibmm)
glibmm: added v2.22.2 - C++ wrapper for GTK+ (depends on libsigc++)
gtkmm: added v2.18.2 - C++ wrapper for GTK+ (depends on pangomm)
gstreamermm: added v0.10.7 - C++ bindings for gstreamer (depends on gtkmm andlibxml++)
libsigc++: added v2.2.8 - typesafe callback system for C++
libxml++: added v2.32.0 - C++ wrapper for libxml (depends on glibmm)
pangomm: added v2.26.2 - C++ bindings for pango (depends on cairomm)
subtitleeditor: added v0.37.1 - a gtk-based subtitle editor capable of displaying the video as well as the audio waveform in parallel for easy synchronization of the subtitle. Requires these packages to be installed as well: libxml++, libsigc++, glibmm, cairomm, pangomm, gtkmm, gstreamermm.