Merge branch '2409_prepare_to_4.7.5'

Merge branch '2409_prepare_to_4.7.5'

* 2409_prepare_to_4.7.5: (60 commits)
  Include inttypes.h instead of stdint.h.
  Modified output of --version key.
  Moved filemanager-related stuff to src/filemanager directory
  Init/deinit clean up
  Cleanup of main.[ch].
  Removed hardcoded actions on ctrl-d and ctrl-h hotkeys. Now these hotkeys defined in keymap file.
  Changes for avoid compiler warnings
  Split file src/keybind.[ch] to lib/keybind.[ch] and src/keybind-defaults.[ch].
  Renamed keybind-related functions:
  Moved charsets.[ch]  from src to lib directory
  Refactoring: removed unused variable
  Removed file contrib/dist/mc.qpg.in
  Removed unneded utility mcmfmt
  History optimization.
  Renamed mc_config_direct_set_string() to mc_config_set_string_raw()
  Optimization of confguration library: delete extra checks
  Menu improvements.
  Optimization of str_msg_term_size().
  Use str_msg_term_size() instead of msglen()
  Split lib/widget/widget.[ch] and lib/widget/wtools.[ch] files
  ...