Add "TextParser.js"

This handles converting data to and from text.
- `parseCustomFormat` and `objectToText` convert data between actual
data and our custom-data definition format.
- `parseSetText` and `exportSetToText` import/export Pokemon data like a
simulatr would
Add minimal Import/Export functionality

Can only import/export in our custom-data format.
Add Team support
Update index.html
Add team to P2