eCAL 5.9.11

Changelog

# Changes

Rec
- Fixed a bug while uploading files, that prevented to upload files with reserved URI characters in their filename (like `#`, `@` etc.)
- Fixed compile issue with very new GCC versions (-> Updated fineftp-server)

Python
  - Relaxed requirement of a specific python-protobuf version. The eCAL Python binding now works with newer Protobuf versions as well without re-compiling.

Installer
- The Windows installer is now signed with a trusted certificate

eCAL 5.10.3 is patch-level equivalent to eCAL 5.9.11