Avoid some Wshadows in GCC 4.8

In GCC 4.7 and 4.8, Wshadow also warns if a local variable conflicts
with a member function. This was changed in GCC 4.9 (GCC bugzilla
57709) but causes a lot of warnings on Travis which is on 4.8. Clang's
Wshadow behaves like GCC 4.9

The worst offendor was Exception's constructor argument being named
`what` which conflicts with the member function of the same name,
being in a public header this causes so many warnings the Travis log
files are truncated.

This fixes Exception and a couple of others. Fixing all cases would be
a slog that I'm not up for right at the moment.

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