COMMON: Add ability to disable warning for valueless lines in INI files

[elasota]

V-Cruise uses an INI-like format for sfx files, where values under the "playlists" section are only simple strings and not formatted as key-value pairs. The INI parser is capable of parsing them, but throws an extreme amount of warnings as there are usually hundreds of lines per animation file in this format.

This adds a function to disable the warning.

[sev-]

Looks good. Thank you for documenting your changes well.