app: switch gimpbrush-transform.c to C++
The next commit is going to parallelize gimpbrush-transform using the gimp_parallel_distribute_foo() functions. To spare us a lot of boilerplate code, we're going to use C++ lambdas as callback arguments to these functions. This commit does the initial conversion of gimpbrush-transform.c to C++, renaming it to gimpbrush-transform.cc. We do this in a separate commit, so that the changes are small enough for git to register this as a renamed file, rather than a new file, so that we don't lose the file's history.
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