Added the String.format() method which returns a formated string using Perl's format() function (with evaluation)
Added the String.format() method which returns a formated string using Perl's format() function (with evaluation)

Example:
	print <<"EOT".format;
| Price: @>>>>>>$ |
         #{12 * 1.5}
| Discout @>>>>>% |
         #{42/5}
EOT

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