Request: Change default/fallback comment style from /* %s */ to # %s

I think that there are many more unpredictably named filetypes which use the `# %s` syntax for comments than there are unpredictably named filetypes which use the `/* %s */` syntax, especially for configuration file formats, which often have no extension at all.

If that's true, it seems to make more sense to explicitly define the types for `/* %s */` and fall back to `# `.