Merge branch 'col-refactor' of https://github.com/kerolasa/util-linux

* 'col-refactor' of https://github.com/kerolasa/util-linux:
  col: replace LINE and CHAR typedefs with structs
  col: free memory before exit [LeakSanitizer]
  col: tidy up sources a little bit
  col: add defaults to switch case clauses
  col: flip all comparisions to numerical order
  col: use size_t when dealing with numbers that buffer sizes
  col: add structure to hold line variables
  col: add update_cur_line() function
  col: add handle_not_graphic() function
  col: initialize variables when they are declared
  col: move option handling to separate function
  col: move global variables to a control structure
  col: use inline function rather than function like define
  col: use typedef and enum to clarify struct
  col: remove function prototypes
  col: add more tests