How to do module as system?

I need to create typography module to replace users input, such as posts, connents, etc with correct mnemonic symbols. For example - (c) to © (r) to ®
I have idea how to do this in my custom theme - override some Tmpl classes, but i'd like to do this on the system level.
I don't like oweride base una classes. I'd like to do this as plugin and I want to be able control this from studio.
Where I can find some analog code example?
Thanks, Alexey.

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