[clang-tidy] Extend 'bugprone-easily-swappable-parameters' with mixability because...

[clang-tidy] Extend 'bugprone-easily-swappable-parameters' with mixability because of implicit conversions

Adds a relaxation option ModelImplicitConversions which will make the check
report for cases where parameters refer to types that are implicitly
convertible to one another.

Example:

    struct IntBox { IntBox(int); operator int(); };
    void foo(int i, double d, IntBox ib) {}

Implicit conversions are the last to model in the set of things that are
reasons for the possibility of a function being called the wrong way which is
not always immediately apparent when looking at the function (signature or
call).

Reviewed By: aaron.ballman, martong

Differential Revision: http://reviews.llvm.org/D75041