Improved internal parameter set/get functions #1077
Merged
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As a first step this PR will fix #1073 but it will need more work as the functions to internally set/get params need a clearer definition and error handling.
The checks to evaluate the type of param has been moved to an assert and made simpler. For the future I'm not so sure asserts are such a good idea but this would have to be part of a bigger redesign of the firmware. I am now only checking the type (PARAM_TYPE_INT and PARAM_TYPE_FLOAT) and if it is setting a param with PARAM_RONLY.