Improve validators

[david]

• Add ability to cast types whereever feasible
• Integrate with i18n

Concrete tasks:

• Number Validation
  • Allow "only int", "only float" or "both" modes
  • Allow casting of values to int or float
  • Make casting optionally disableable
  • Automatically use the current locale information to parse values, i.e. "5,14" instead of "5.14" for German and others
  • Allow overriding of the locale used to parse the information
  • Allow disabling of automatic locale use

• Date/Time Validation
  • Get rid of mktimestamp validator
  • Build one validator for date, time and datetime validation
  • Can parse from one field or multiple fields
  • Can normalize values (d, m and y field to one value or other way round)
  • Can cast values (to unix timestamp, to formatted string, to to Calendar object, maybe PHP 5.2 DateTime? object?)
  • Automatically use the current locale information to parse values, i.e. "01.12.2006" instead of "12/01/06" for German
  • Allow overriding of the locale used to parse the information
  • Allow disabling of automatic locale use
  • Allow specifying the name of a parameter given to each locale that contains a parse format string

[dominik]

(In [1463]) add in_locale, no_locale and cast_to parameters to the number validator

refs #359

[dominik]

(In [1482]) BREAKING CHANGE! rewrite date validator to contain the stuff in the ticket to see what the new parameters are check the phpdoc refs #359

[dominik]

(In [1484]) add minimum and maximum constraints for the date validator (allows referencing already validated dates too) refs #359

[dominik]

(In [1485]) BREAKING CHANGE! removed mktimestamp validator and time validator. This stuff can be accomplished with the date validator now closes #359