Combine normalize and parseoptions, and update combined option handling

[shadowspawn]

Pull Request

(This is the same PR as #1145, but rebased to clean up the commits listed.)

Problem

.parse() called a private routine .normalize() to split short options, turn --long=value into --long value, et al. This caused a few subtle problems:

• the extra functionality was not available when called public routine .parseOptions()
• the expansion was done before the types of the flags for subcommands were known, so support for including value in argument like -fValue (added in #395 fix, short options do not understand adjacent values #599) only worked for top level command
• an argument into a subcommand option could get incorrectly processed as a global flag due to early expansion, like do sub --flag=--version

Solution

1. roll the support into .parseOptions and delete .normalise
2. expand arguments only for known options
3. as a bonus, add support for multiple boolean short flags followed by a flag expecting an argument (in subcommands as well as top command)

So for example:

program
  .command('sub')
  .option('-w,--www')
  .option('-s,--secure')
  .option('-p,--port <number>')
  .action((cmd) => {
    console.log(cmd.opts());
  });
program.parse(process.argv);

Can now call like:

# my-program sub -wsp443
{ www: true, secure: true, port: '443' }

ChangeLog

Added

• combined short options as single argument may include boolean flags and value flag and value (e.g. -a -b -p 80 can be written as -abp80) (parseOptions rework phase 2 #1145)
• .parseOption() includes short flag and long flag expansions (parseOptions rework phase 2 #1145)

Changed

• only recognised option short flags and long flags are expanded (e.g. -ab or --foo=bar) (parseOptions rework phase 2 #1145)

Fixed

• combining option short flag and value in single argument now work for subcommands (e.g. -p80) (parseOptions rework phase 2 #1145)

Removed

• private function normalize (the functionality has been integrated into parseOptions)

[abetomo]

LGTM!

[shadowspawn]

Thanks @abetomo , merging now.