espidf.IDFError is used in contexts that are not ESP-specific

[dhalbert]

espidf.IDFError is a subclass of OSError, which is a subclass of Exception. raise_esp_error() is a general routine that is used to check ESP-IDF error codes and raise espidf.IDFError with an appropriate message.

There are a number of non-ESP-specific contexts in which this error is raised, such as AnalogIn, neopixel_write, PulseOut, etc. where something like RuntimeError would be more appropriate, because the error is something that doesn't need to be designated as ESP-IDF-specific.

I am wondering whether we should change the type of the raised exception, or whether we might make IDFError be a subclass of RuntimeError instead, because many of the errors are not "OS"-related.