Adds Missing Const Specifiers to Member Functions

[economon]

Proposed Changes

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Adds const specifier to member functions and also const to some function input args where applicable.

Related Work

Resolve any issues (bug fix or feature request), note any related PRs, or mention interactions with the work of others, if any.

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[pcarruscag]

Some of those methods are not const in the true sense of the word, they change memory managed by the class and the only reason compilers allow them to be const is the quirky conventions around raw pointers, i.e. if those member variables were of a reference type, or container objects the compiler would not allow const anymore (unless they were declared mutable), even though the method would be doing the same work.
I think it is safe to say that any "Set" is not const.

[economon]

As you probably guessed, these changes were automated. I have made a pass manually and removed const from setter methods where it doesn't make sense.

[pcarruscag]

LGTM