Remove/change deprecated commands & options/defaults

[delphidabbler]

In next major release the following command options need to be removed or changed following deprecation in the current version:

• Remove html4 option from --doc-type command.
• Change default option for --doc-type command from xhtml to html5.
• Remove --hide-css command.
• Remove --legacy-css command.
• Change default option for --viewport command from none to mobile.

ℹ️ The deprecated commands and options listed above were taken from PasHi v2.2.x help screen.

[delphidabbler]

Also need to remove the -m switch that was deprecated when the --trim command was updated.

ℹ️ per PasHi v2.3.x help screen.

[delphidabbler]

Also need to remove the -m switch that was deprecated when the --trim command was updated.

-m is proposed to be re-implemented as an alias for --trim.

[delphidabbler]

Further deprecations for --trim to implement:

• Change default from lines to either - or all (TBC).
• Remove all Boolean parameters, e.g. yes, off.

ℹ️ per PasHi v2.3.x help screen.

[delphidabbler]

--verbosity default to change from normal to {warnings,errors}.

--verbosity normal will either be deprecated or removed in v3 (TBC).

ℹ️ per PasHi v2.3.x help screen.