[rfc][icedtea-web] use Option Parser in itweb-settings

[Lukasz Dracz]

Hello,

This patch changes itweb-settings to use the Option Parser. Only one itweb-settings command can be used at a time in combinations with help and headless. Help specified with a command will return the help for that command. The commands however have been changed to allow the use of multiple arguments ex. itweb-settings get deployment.manifest.attributes.check deployment.console.startup.mode deployment.log.file will get all three arguments. Added functionality for EVEN_NUMBER_SUPPORTS_EQUALS_CHAR which is used in the set command so now it is possible to enter arguments for the set as property=value or property value or a combination of this.

Thank you,
Lukasz Dracz
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