* It was not clear that RNA_parameter_length_get() & co only affected dynamic properties, renamed them to RNA_parameter_dynamic_length_get() and such.
* Fixed RNA_function_find_parameter(), we can't use BLI_findstring() here, need to call RNA_property_identifier()!
* Fixed RNA_parameter_get() and RNA_parameter_set(), which were completely wrong for dynamic properties.
* Fixed RNA_parameter_dynamic_length_get/set_data(), they did not check the property was actually a dynamic one and were using again ugly blackmagic casting intead of ParameterDynAlloc structure!
* makesrna was still using an ugly hackish (and perhaps not always working) code when handling dynamic parameters, now synchronized with RNA_parameter_dynamic_length_get_data and RNA_parameter_get code.
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