Option to keep metadata files in same folder as original

[Abdallah-Youssef]

This addresses issue #4.

If the user sets the folder setting to "./", then the metadata files will be placed in the same directory as the original file.

[Servinjesus1]

@Abdallah-Youssef Does this create a conflict if the note already exists? It would be nice if it didn't and instead the non-markdown file was considered "not new" and added back to the plugin's memory. Right now, if I move or rename the file and its markdown copy outside of Obsidian then the plugin thinks the file is a new non-markdown file, because even though there's a meta file, the plugin's memory of where the binary file was is now off, which leads to conflicts.

Note that it would probably be best to still try to make a file if 'unlinked binary files' command is specified and the existing meta file happens to not have a link to its binary file.