Update for PHP 7.2 or later

Add support for a space as separator between --longopt and its value; i.e.,
--longopt val (in addition to the existing --longopt=val).

Hygiene release: update license year, remove branch alias, and update docs.

This release modifies the testing structure and updates other support files.

This release adds a feature: Getopt defintion strings now allow for noting positional arguments using the #argname and #argname? notation, optionally with an argument description. These are ignored by the GetoptParser for purposes of value-discovery, but the Help class does use them to auto-generate usage lines.

This is a hygiene release to update documentation and support files.

• FIX: add explicit Help config for non-auto-resolved DI

• FIX: Context\Env::get() now additionally examines getenv() for values; fixes #47
• FIX: add explicit Context configs for non-auto-resolved DI

• TST: Update testing structure, disable auto-resolve in container tests
• DOC: Update README and docblocks
• FIX: #35, for when posix_isatty() function does not exist

First 2.0 stable release.

• DOC: Add docblocks, update README.
• ADD: Method GetoptFactory::getGetoptParser()
• FIX: #29, fixes color formatting
• REF: Various refactorings to split up Getopt tasks, add GetoptFactory, extract OptionParser, etc
• DEL: v1 config files
• ADD: v2 config class files
• CHG: When defining options, allow the '' before *or after the ':'
• BRK: Rename OptionParser to GetoptParser
• ADD: Help class
• FIX: Getopt alias ordering