Changes

Fixed issue #218, caused by new libclf versions

> **Note**: This commit message is written in Markdown for the sake of
clean documentation.

This commit fixes issue
[#218](https://github.com/EasyRPG/Editor/issues/218)
which was a combination of compilation errors starting from libclf
commit `b6a280bc57b31fd3ebad3b55b5ae75a5bec46a61`. Another error
appeared as well, starting from `2a2e0d3900bfd11826626a8b28c7a6bf9bcb410c`.
 (commit: b98fc86)