Replace "type()" with "type().__name__" in python error messages

During the CAMDEN configure and build stages there are numerous python type-checks which throw an error describing what the variable type is and what it should be. In general this is done using code like:

`print(type(x))`

Which if `x` is a string results in something like:

``

However, that could be confusing to users who are not particularly familiar with python. Instead one could do:

`print(type(x).__name__))`

which results in:

`'str'`

which would hopefully make the error message easier to understand, at least for non-python users.