StringVariable's ToFile - Relax File extension and path

[jetrotal]

When saving a file, maniacs forces the File in Text/ folder with .txt extension.
Through this PR, if '*' is at the end of filename, the file extension is relaxed.

[carstene1ns]

Does this open an issue with path traversal: ../../../some/file?

[jetrotal]

I guess not, the default behavior allows leaving the /text/file.txt by using ../charset/file.txt as a file name.

my code, simply moves the text file from /text/ to the root of the game whenver the filename ends with *

[Ghabry]

In an ideal world where Maniac Patch and TPC are open source and not obfuscated I would suggest to add a new flag to indicate "absolute path". End of rant

---

This is a bit opinionated but I do not like the *. The typical convention for an absolute path is to prefix it with /. You should be even able to forward such a path directly to OpenOutputStream without removing the slash manually.

Can you add a comment that this is an EasyRPG Extension?

(Also please remove trivial comments like // Remove the last character. Makes the code look less ChatGPT-generated.)