* Use ScriptValueP for all Value types.
  All Value types now inherit from AnyValue, all Fields inherit from AnyField.
  Common properties, in particular scripting, are done by AnyValue/AnyField

* Repurposed ImageValueToImage as the representation for image values.

* Added LocalSymbolFile as the representation for symbol values.

* Moved FileName to package.hpp, and renamed it to LocalFileName.
  The notification of packages that was previously done by Reader/Writer is now done by LocalFileName.

* Added toFriendlyString to ScriptValue, it is used (primarily) for the card list.
  The idea is that this function strips tags and always returns something, for example "<image>" for images.

* Removed backwards compatibility with 0.2.7 style tags, since I was too lazy to update it.

Code is a bit messy right now, since cleanup will come in separate commits.

fix: check starting_age <= age, instead of starting_age < age. Otherwise we can get into an infinite loop!

Documented both of them

(now actually compiles)

commit new icons(downloaded from 2011-09-15 release from http://mtg.pifro.com/viewtopic.php?f=26&t=1457)

 * added simple history browsing with up/down arrow keys
 * show whether MessageCtrl has focus
 * don't draw lines between input and resulting errors

commit latest version (downloaded from 2011-09-15 release from http://mtg.pifro.com/viewtopic.php?f=26&t=1457)

 * Added after_reading function that is called by Reader after reading a complete object.
   This generalizes Packaged::validate, which is now also called via this mechanism.
 * Use a single 'last_modified' Age, instead of a separate one for scripts. The counter should now only go up by 1 for each Action performed. In theory the counter could also be made local to ScriptManager.

 * added some utility functions for working with ScriptDefaults

remove last_change from MultipleChoiceValue. It is now stored in the action, which makes more sense.

 * use ScriptValueP, wrapped in AnyValue, instead of the specialized value types
 * serialize these values using script syntax.
 * However: #ifdefed out for now, because I first wanted to commit the following change:

This requires a change to handling of last_change of MultipleChoiceValue. Instead of storing it in the field, it is now just part of the action. The action therefore has to be passed to Value::update.

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TODO: be consistent with thumbnail generation, where the value is converted to canonical form first.

Added ScriptDefault type, a wrapper that indicates that a value is in the default state. This will replace Defaultable<>