Draft: Fix FR-44064: Unsupport Java 8 and raise minimum supported version to Java 11

Recreated MR here: !195 (merged)

This MR is meant to unsupport Java 8 for Openbravo compilation and raise the minimum version supported to Java 11.

Blocking MRs (Merge before this)

• https://gitlab.com/openbravo/product/pmods/org.openbravo.client.analytics/-/merge_requests/3

Tasks

• Update build.xml
• Update Eclipse's preferences
• ...

Links

• Project page