Guacamole-compose

Fixed
- internalProxies in server.xml to be more generic and work no matter the internal rwp address.
- Added checks for `guacamole-compose --init` to not overwrite existing files.

Fixed
- create the ./shared folder with the --init command (without sudo). This fixes a permission issue where users would have to `sudo chown user:user ./shared` for file transfers.
- Updated README.md to remove `sudo` from in front of `guacamole-compose --init`
- Updated the internal proxies from 127.0.0.1 to the default. (as the rwp container will not be 127.0.0.1 to the guacamole container.) This is safe as the guacamole container does not have any exposed ports.

Added
- server.xml so that the guacamole webpage correctly shows the remote address via X-Forwarded-For.
- `option forwardfor` in the haproxy templates.
- code in the init section to create the server.xml file from the template in ./tomcat folder.

Fixed
- Updated nginx init conf with max body size of 10000 (for large file transfers.) Nginx configuration option already had this set.
- Duplicate documentation section in README.md on updating groups and connections.