JBIDE-14897 - livereload auto config is not as intuitive as it could be

Rework the messages dialogs.
From now, the 'proxy' is part of the LiveReload server, which means that it is always started with the LR server itself, and
it does not appear in the Server Configuration Editor as an option.

After PR review:
- removed jar from repo
- added timeout check in all loops used in conjunction with Future (java.util.concurrent)
- edited a message in a bundle
- Removed *all* jars from plugins and configured pom.xml to download them and put them in ./lib
- added a lib in .gitignore to avoid committing more jars :-/