tinyxml2 wrapper

can handle:
- real and complex matrices: scalars, 1D, 2D, N-D arrays
- struct arrays
- cell arrays
- function handles
- nesting of structures/cells
NOT supported: objects, xml attributes (are used for types and sizes)
usage:
tinyxml2_wrap('save', filename, variable)
tinyxml2_wrap('save', filename, variable, exportOptions)
variable = tinyxml2_wrap('load', filename)
... parse, format, version modes: see help
compile with:
mex tinyxml2_wrap.cpp tinyxml2.cpp
performance:
on average up to 10x speedup over using XML Toolbox by Marc Molinari