[FR] flatc generates names of output files

[dbaileychess]

Some build systems (👀 at you bazel) require knowing all the generated filenames up front, so their custom generation build rules work. See genrule's outs parameter, as an example. With flatc right now a single schema can generate multiple files depending on language and configuration flags, and its hard to know a priori what files are going to be produced.

We sort of have something with our flatc -M option, that prints out a "MakeRules" file per language. But its in a make file format which might not be the best representation, nor is it consistent across languages, or even implemented for every language. So I think one generic implementation that just spits out the generated files names, 1 per line to stdout, would suffice.

@aardappel for historical comment.

[aardappel]

Yeah that sounds fine, whatever format is easiest to process for these build systems. May want to also keep the original -M format for whoever is using it.

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