Add universal ctags support

[Felixoid]

Hi. There is universal ctags which supports hierarchy.
This PR implements checking, which ctags installed, and chooses config for tagbar accordingly.

[Felixoid]

NB: for fixing Ctrl+] jump to class instead first any include second commit was done

[Felixoid]

@masatake Hi. Maybe this would be interesting for you also. I'm not completely sure about config correctness, but it looks good enough. https://github.com/rodjek/vim-puppet/blob/598b48b064ba1d6e03667a35ac478abb02d7a396/ctags/puppet_u.ctags

[masatake]

@Felixoid, thank you for this notification. I'm very interested in.

Universal-ctags has built-in puppet parser. Isn't it enough?
https://github.com/universal-ctags/ctags/blob/master/optlib/puppetManifest.ctags
See the output of u-ctags --list-languages | grep -i puppet.

...

I compared my implementation with yours quickly.
Mine doesn't recognize include, site, and default.
Supporting include cannot be done in mine because it should be captured as reference tag.
(http://docs.ctags.io/en/latest/news.html?highlight=reference%20tag#reference-tags)
I have not implement the way to record a tag captured by a regex parser as reference tag yet.
This is the second time people need it. I have to think about implementing it.

About site, I cannot find its definition in https://puppet.com/docs/puppet/5.3/index.html quickly.
I guess I can add a code to my parser.

About default, I wonder how I should do.

Anyway, I would like you to try my parser that is built-in u-ctags. And I would like to hear the comments from real users. Mine is stateful, so you will see a serious bug. I would like to fix it.

I don't know puppet well. I wrote my parser because I would like to test newly written multiple state regex meta parser. Therefore the comments from real users are important for me.

[masatake]

BTW, when writing a parser even if it is not large, I recommend you to make a test input and its expected output; and commit them to your repository. A regex parser tends to be too complicated. The test case and the expected output help people maintain the parser.