Improve compatibility with CLEO5

[x87]

Improving compatibility and fixing some no longer valid assumptions about CLEO.

• CLEO folder can be relocated from root. Use CLEO SDK to figure out where it is.
• CLEO5 moved .cleo plugins from CLEO folder inside CLEO_PLUGINS folder. It broke some scripts that used path relative to CLEO folder which previously had resolved thanks to CheckASI fallback. Add explicit CLEO folder scan if no other location succeeded.
• Always prefer absolute paths when returning script search results to CLEO

Everything is behind IsCLEO5 check and don't affect earlier versions.
Tested in game.

[thelink2012]

Thanks for the PRs Seemann. I'll be looking into them as soon as I have some time and integrante them into a release.