Merge branch 'mc-4.6'

Merge branch 'mc-4.6'

* mc-4.6: (38 commits)
  mhl: mhl_shell_unescape_buf(): fixed memory array OOB.
  completion: fixed complete already escaped secuences.
  completion: added changelog entry for solved #147
  completion: fixed completion of escaped commands in commandline
  Removed unused char*.
  mhl: added mhl_strmove() function (memmove semantics)
  completion: added escapes in command line on completion
  complete: cleanup: #define to enum INPUT_COMPLETION_FLAGS
  added a new parameter for completion flags to input_new
  fish: cleanup: unboxed quoted strings when generate shell commands
  introduced new type SHELL_ESCAPED_STR for more type safety
  added mhl/types.h which defines bool enum, escape.h now using this type
  Removed unused variable
  Changes for use MHL.
  Fixed bug with renamig/copying files with backshashes in names
  Remove some testing stuff
  Temporarry commit. Fixed completion in browse by directoryes.
  Fixed some memory leaks.
  Add $ and ` for escaping and reorder it according to the ascii values
  Rewrite it to use g_string_append_c instead of some homebrew stuff
  ...