Feature Request: Automatic rules

[ktaragorn]

A good feature to have would be Automatic rules. These would be processed whenever a transaction is created, which is especially useful when transactions are imported enmasse via CSV etc.

At its most basic this would allow for rules such as if the description fit a certain pattern, apply a particular category. More features could be added such as if it fits a pattern, rename it according to some logic. This feature is present in firefly III and also in another tool ive used, https://www.buxfer.com/. They can be looked to for specific inspiration.

[qedi-r]

I have an initial version of this feature in my https://github.com/qedi-r/silverstrike/tree/flexible-transaction-rules branch I've been playing around with off and on.

@simhnna if you have thoughts/suggestions on it, I could probably update it into a full feature instead of just a prototype.