JSON layouts, Alloc chunk iterators

- saving to JSON format
- ozCore
  * Alloc
    + iterating over alocated chunks: objectCIter(), arrayCIter()
    + printSummary() -> Log::printMemorySummary()
    + printLeaks() -> Log::printMemoryLeaks()
  * String(float) -> String(double), parseFloat() -> parseDouble()
- matrix
  * read( const JSON& ), write( JSON* ) on Object, Struct, Frag, Matrix etc.
- client
  * Ctrl+F9 toggles UI
  * GameStage
    + reload() removed, new GameStage is scheduled instead
    + readLayout(), writeLayout()