Add exemptions to word replacement

[interrrp]

This is a partial implementation of #29 since it only exempts words. Should probably update it for full strings but that'd be more complex.

[somehybrid]

exemplifications should be made with a regex, such as checking :(.+?):. in places where word-exemplification is necessary, the exemplification should be done in the nyaify and char_replace functions, such as replacing "lol" to "wow"