utcaApp: remove usage of sentinel parameters. #48
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This is a code cleanup, to avoid having to expose
UDriver::parameter_props to specific drivers.
The cleanup moves all handling of special cases (decoder_controller and read_only) into the ParamInit class, instead of requiring passing UDriver static inline members to it. This allowed us to add a ParamInit::set_dc() function, which is now used by the drivers which previously had to access parameter_props directly. This also simplifies the UDriver constructor, since it can now determine the need for p_tmp more easily, as well as the parameter properties.
It also allowed us to add more sanity checks, in this case to UDriver::writeGeneral(), to report writes into read-only parameters.
As suggested by Henrique in #45 (comment)
@gustavosr8