Version 4.6 sequel

[yasuking0304]

Add/Modified new keywords for Ver.4.6 sequel

I referred to here and picked up the missing basic keywords.

• added/modified version 4.0-4.6 characters
• added version 4.3-4.6 foods
• added version 4.0-4.6 items
• added/modified version 4.6 locations
• added version 4.6 objects
• added version 4.6 organizations
• modified version 4.6 weapons
• added/modified version 4.5-4.6 y-events

Closes #202

[xicri]

I have committed some suggestions by myself because I think they do not require your confirmation. Please review the rest of the comments.