Apply clang-format-all.sh using the _clang-format file through all the cpp/.h files.
make sure not to apply it to certain serialization structures, since some parser expects the * as part of the name, instead of type.
This commit contains no other changes aside from adding and applying clang-format-all.sh
error_message and warning_message are common strings that are likely to
collide. Renamed to bt_id_{error,warning}_message to more strongly
uniquify.
grep -r error_message -l src/BulletInverseDynamics | \
xargs sed -i -e "s/error_message/bt_id_error_message/g"
grep -r warning_message -l src/BulletInverseDynamics | \
xargs sed -i -e "s/warning_message/bt_id_warning_message/g"
