Fix Travis CI builds (#1107)

* fix: Fix Travis CI builds and (some) tests

https://config.travis-ci.com/explore recommendations:
  * Set the `os` key
  * Removes the `sudo` key

Fixes:
  * Missing dependencies

Cleanups:
  * Set `build_command_prepend` and `build_command` to match the process
    performed by the before_script and script.
  * Removed unnecessary apt package dependencies.
  * Ran the file through prettier (https://prettier.io/).

Enhancements:
  * Bumps dist to Ubuntu 18.04 (Bionic)
    * This bump allows us to install a few packages that were previously
      installed manually.
  * Added a Clang build.

TODOs:
  * X11 tests are broken. I've commented them out for the time being.

* Create multiple jobs

Jobs (4 total):
  Compilers:
    * Clang
    * GCC
  Build tools:
    * Autotools
    * Meson

Enhancements:
* DRY out the CI config.

Failure (seemingly related to `check`?) here:
https://travis-ci.org/github/davatorium/rofi/jobs/680265096#L1125

* [Travis] More debug output

* [Travis] Add ldconfig

* [Travis] try to fix doxy tests.

* [Travis] Try to fix doxygen stuff.

* [Travis] Trying to fix meson doxy gen tests.

* Minor cleanups

Co-authored-by: Dave Davenport <qball@gmpclient.org>

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