Add a switch for processing function names

[1MLightyears]

fix #31 .
A few descriptions of this change:

• add a parameter self.raw_func_name. If it's False, treat all underlines in function name as label of subscript (output f_n as f_n); otherwise treat underline as part of function name (output f_n as f_n).
  defined in LatexifyVisitor.__init__(), default is False to keep consistency with default behaviors in previous editions.
• As a result, change arguments of with_latex, get_latex, etc. to (*args,**kwargs) for future use (and they are already used this time). Might be more and more parameters for decorators, I think collect and process them all at LatexifyVisitor.__init__() is a kind of makeshift...

[google-cla]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed (or fixed any issues), please reply here with @googlebot I signed it! and we'll verify it.

---

What to do if you already signed the CLA

Individual signers

• It's possible we don't have your GitHub username or you're using a different email address on your commit. Check your existing CLA data and verify that your email is set on your git commits.

Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
• The email used to register you as an authorized contributor must be the email used for the Git commit. Check your existing CLA data and verify that your email is set on your git commits.
• The email used to register you as an authorized contributor must also be attached to your GitHub account.

ℹ️ Googlers: Go here for more info.

[1MLightyears]

@googlebot I signed it!

[odashi]

Thanks!

[1MLightyears]

Thanks!

OMG That was a PR 2 yrs ago 😲
It's great to see still working on this anyway. Thank you!