Seaside-Core is a bit large

[marschall]

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When loading just the REST group a lot of things aren't directly needed. Things that come to mind:

• Seaside-Core-Callbacks, only really used with components
• Seaside-Core-Backtracking, only really used with components
• Seaside-Core-Cache, only really used with sessions
• Seaside-Core-Document*, a lot of classes are only used with HTML
• Seaside-Core-Libraries, only really used with HTML
• Seaside-Core-Rendering, most classes are only really used with components