Added content for White side

I've dedicated some time to handling the white side, making the available content for black and white mostly equal. Xi's stuff is next. The next release will definitely contain content up to Battle 4, though I'm undecided on whether I should push through to translating/editing all the way up to ending one or not.

My current plan goes like this:

• Translate/edit up to story stuff after Battle 4, but before Battle 5. (Possible release)
• Translate/edit to the first ending, including Battle 5. (Certain release)
• Translate/edit Black side content between ending one and ending two. (Possible release)
• Translate/edit White side content between ending one and ending two, including ending two itself. (Certain release)
• Translate/edit the non-story battle sections, which become available after ending two (Possible release)
• Translate/edit the "deep memories". (Possible multiple releases, certain when all done)