Merge branch 'ds/config-list-with-type' into next

Merge branch 'ds/config-list-with-type' into next

"git config list" is taught to show the values interpreted for
specific type with "--type=<X>" option.

* ds/config-list-with-type:
  config: use an enum for type
  config: restructure format_config()
  config: format colors quietly
  color: add color_parse_quietly()
  config: format expiry dates quietly
  config: format paths gently
  config: format bools or strings in helper
  config: format bools or ints gently
  config: format bools gently
  config: format int64s gently
  config: make 'git config list --type=<X>' work
  config: add 'gently' parameter to format_config()
  config: move show_all_config()