Allow specifying additional forbidden characters in file names

Obisidan’s list of forbidden characters has changed over time; it used to be a list similar to Dropbox’s for maximum interoperability, and now is a short list of \ / :

I found a summary of related bugs that prompted those changes: Allow for special characters (colon, / within file name and links) - #4 by andrezgz

I do run obsidian on multiple systems (primarily Linux and Android) and " seems to be a problem on Android to the point that it blocked Obsidian from syncing without my realizing.

I’d much prefer to be able to add " to the list of illegal characters in my Obsidian config, but I don’t think the list is configurable. Could we make it configurable?

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