Merge pull request wp-cli#123 from wp-cli/use_preg_split_in_safe_substr

Use preg_split instead of preg_match with quantifiers in safe_substr.

Merge pull request wp-cli#120 from urlund/master

Added str_pad optional arguments

Merge pull request wp-cli#118 from wp-cli/issue_117

Use grapheme_substr & pcre_match in safe_substr for wp-cli#117. Ascii::columns fix.

Merge pull request wp-cli#113 from wp-cli/issue_112

Suppress tput stderr. Use COLUMNS env var 1st if available.

Merge pull request wp-cli#111 from gitlost/issue_106

PR 109 (double-width wrapping) and issue 106 (pre-colorization).

Merge pull request wp-cli#105 from gitlost/issue_4127

Shell:columns(): Better calc on Windows. Check TERM. Make testable.

Merge pull request wp-cli#104 from Luxian/master

Bring back default values and fix tests

Merge pull request wp-cli#94 from wp-cli/decolorize-safe-str-pad

Only decolorize in `cli\safe_str_pad()` when colorizing

Merge pull request wp-cli#93 from wp-cli/placeholder-character-colorize

Use a more impossible placeholder pattern in `Colors::colorize()`

Merge pull request wp-cli#83 from tiagohillebrandt/master

Verifies if exec is not in disable_functions directive