implementation of headers (1)
added convenience method to convert a handle from a list to an int
added header section
first steps in implementation
refactoring of blocks
refactoring of block management
refactoring to optimize and simplify the code
Refactoring general para evitar dar tantas pasadas en la carga, y para incrementarla legibilidad del codigo (demasiados if-else-if en vez de usar polimorfismo)
optimizations: layers are saved in the first lecture, etctries to solve layer handle problem.
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