Various issues with Japanese mode

[drojf]

Bugs

Some issues were reported using Japanese mode on the answer arcs. I've applied fixes to this branch (NVL mode) https://github.com/07th-mod/umineko-answer/tree/fix_jp_voicedelay_applied .

The fixes might not cover everything 100% - the user is testing the fixes by playing through the game.

I was thinking it would be easier if I restrict Japanese mode to be NVL mode only, unless I can get someone to test both Question and Answer in ADV mode.

Various issues with automatic voice timing [Fix being tested in NVL mode]

I've mostly fixed this by copying or inserting voicedelays as appropriate.

I also applied fixes for the problems reported here: 07th-mod/umineko-question#173

Backlog [Fix being tested in NVL mode]

The backlog is still 1280x720 instead of being 1920x1080.

Copying the existing code from the EN backlog seems to fix this issue.

English Umineko logo instead of JP logo [wontfix?]