Prevent chain files from being saved in install directory #2835
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We've had numerous reports of people thinking that it is a good idea to save their chains in chaiNNer's install dir, only to lose all their chain files after updating (for example, #1756).
This PR should prevent this in the future. Now, if someone tries to save to this directory, it will error and tell them to pick a different one. Also, it checks on startup if any chain files are stored in this directory (i.e. if someone moved them there manually) and gives a warning before starting up.
One concern is that this still applies in portable mode. It's most likely fine for people to put chain files in their portable folder, so should we not do these things for portable installs?