+ Added dialog closing by "Esc" button for the FirmwareDialog.
Removed libslic3r from the default include paths for all modules but libslic3r. Now headers from libslic3r need to be included with an explicit path (libslic3r/libslic3r.h etc) Split the localization macros into I18N.{cpp,h}
The XS was left only for the unit / integration tests, and it links libslic3r only. No wxWidgets are allowed to be used from Perl starting from now.
