Fix CI for java 11 and add maven wrapper
- CI configuration now only support Java 11 instead of 7 and 8.
- Maven wrapper is included in Git: this allow to freeze the version of Maven used (currently
3.6.3
) in order to avoid side effect related to Maven evolution. Note that currently CI does not use the wrapper but use the same Maven version. - Update
.gitignore
to ignore more Maven file. - Freeze plugins version for "site" and a plugin called by "site": "project info reports" ("site" is executed by CI).