So, I feel bad for asking a question about my focus but one thing I don't know is how the French accent has changed over the years. I know that German accents are very regional to this day and that the British accent has changed over the centuries (and is also regional) but what about the French accent?
Is the French accent currently known the accent of Revolutionary French speakers? And to further the question, do regional accents differ in the same manner over time?
tl;dr: It's not exactly the same, but still fairly similar as compared to earlier periods.
300 years is a long time when talking accents.
As far as Romance languages go, French has one of the least conservative phonologies. There have been a very large number of changes to the pronunciation as compared to many of the related languages.
In the 1700s what they were speaking can be classified as Early Modern. As I said in the tl;dr it wasn't too different, but still had a few features that are now gone from the language. Some of the main differences are things like the loss of final /ə/ and the final nasal coda (which is now just a nasal vowel) which were both present around the time of the Revolution.
I actually recommend taking a look at Wikipedia for this question since there's a pretty quick summary given on the article about the phonological history of French.
That will give the bullet points of the most significant changes. If you have follow up questions about how these changes have happened I'll be happy to do what I can to explain things in more detail.