Change Eclipse project name

Signed-off-by: Stefan Marr <git@stefan-marr.de>
There are multiple RPython-based SOMs now

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Fix style to sync with RTruffleSOM

- remove redundant parentheses
- simplify string for warning
- make _is_binary_signature protected
- remove unused imports
- fixed whitespace and capitalization in tests

Signed-off-by: Stefan Marr <git@stefan-marr.de>