ui: GPA calculator

[joshuaf745]

The GPA calculator should have a variety of improvements; here's what comes to mind first:

• Instead of having an "Add Course" button, there should be "Add {Regular, Accelerated, Honors/AP}" to make it easier when entering multiple courses
• There should be a way to organize it by semesters, and copy over classes.
• Unlikely, but we should perhaps see if the people who run IRC (who are they??) are willing to expose a [Google account authenticated] API to access IRC.

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