Now you can set/get: float, arrays (int and float) and string.
The only special function is OP_get_string, it is special
because return a pointer to the IDProperty data, so you can't
change/resize/free the string.
It's possible "fix" this with:
1) Return a "const char"
2) Return a duplicate string
All this new function are not in use yet, but i make a simple test
with the "move areas" operator (add a property of every type and then
print the result in the other size) and work fine, more test are welcome.
Other thing to check is the new OP_free_property function, because this
properties are only local to the operator, i choice free all this in the
"exit callback" of every operator (only move areas have property now),
so comment about this are welcome too :)
Also add some notes to the WM_api.h file.
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