Fixes and cleanups for Course and cumulative GPA

[gary-kim]

TODO:

• Fully fix calculation
  • Fix counting courses without a normal grade
  • Still seems to be a bit off from what it should be. Gonna investigate further.
• Nitpicks
• Migrate to Vue
  • Go to Cialfo for official GPA message

[Suhas-13]

Do you think it would be possible to release the current cumulative-gpa feature with just the fix you made in this PR?

[gary-kim]

Whoops, this escaped my mind. Feel free to ping me if it looks like I forgot about something. Let me just get at least the Vue migration done.

[Suhas-13]

Seems to be good, just a question though, does Cialfo include the current semester when calculating? If it doesn't then the extension might be off from Cialfo which might confuse some users.

[Suhas-13]

I don't think Cialfo includes semesters in progress GPA but I may be wrong, if it does not it might be good to add something to the disclaimer indicating that Cialfo does not include that whereas the extension does and as such may be different.

[gary-kim]

Good point. How about we phrase it like "You can check your official GPA at Cialfo (does not include current semester)"?

[Suhas-13]

That sounds good, should be clear enough.