[JXR-61] Include bottom text in all pages

- Apply same HTML structure to all bottoms
- Do not right align footer because other plugins don't align too
- Pass around the bottom text, though this is bad design. Unfortunately, a lot of params are passed around through methods instead settings them through setters once if they do not be different for every processed file. E.g, inputEncoding, outputEncoding, etc.

git-svn-id: https://svn.apache.org/repos/asf/maven/jxr/trunk@1544863 13f79535-47bb-0310-9956-ffa450edef68