Major rewrite for better maintainability & bugfixes

• Removed arrayStringMix, replaced with autoUpgradeToArray, which supports arrays of objects.
• Added check preventing mixing of scalar and object values in an array.
• Added Struct and Analyzer classes that take care of the data analysis and storage of structure.
• Struct::load() now checks integrity of the structure on load
• Arrays in the Struct now contain their type (eg. arrayOfinteger)
• In a non-strict mode (default), all scalars are now identified as scalar from their initial analysis, not when a mismatch is encountered.