Grand Cross: add Ero-On!, Homu Plus, Sena Plus and Rikka Plus; fix Nyaru Plus

[kagaminehaku]

Adds four Grand Cross (ShiinaRio engine, WARC 1.7) titles and fixes one existing scheme. Only ArcFormats/Resources/Formats.dat changes, in two commits.

New games

Game	Executable	VNDB	ExtraCrypt
Ero-On!	ERO_ON.exe	v11473	MakiFesCrypt
Homu Plus	HOMUPLUS.exe	v8019	MakiFesCrypt
Sena Plus	SENAPLUS.exe	v10126	YuruPlusCrypt
Rikka Plus	RIKKAPLUS.exe	v11902	KeyAdlerCrypt

No code changes are needed: all three ExtraCrypt classes already exist.

Fixes

• Nyaru Plus: the dword at 0x1020 of its DecodeBin (the module build date) was 0x20080214, copied from another game. The game's value is 0x20120710. With the wrong value, entries whose Decrypt2 step reads that slot come out corrupted. In the retail archives this is NYARUPLUS_G.WAR:RULE213.S25, whose row table pointed past the end of the file. The array was shared with other schemes, so only Nyaru Plus gets a corrected copy and the other games are unchanged.
• Oreimo Plus: the scheme was already correct but had no executable mapping. OREIMOPLUS.exe is now mapped, so the game is detected automatically.

Notes

• The new ShiinaImages reuse the existing shared 33,438-byte engine image and only add a per-game tail. CryptKey, Region and DecodeBin are the same arrays as Azu Plus, and Sena Plus shares its key table with Yuru Plus. The database grows by about 40 KB.
• New schemes are inserted in alphabetical order. The database version stays 148.
• The file was written with FormatCatalog.SerializeScheme, the same way as SchemeTool. Loading and re-saving the original file without changes produces an identical payload.

Testing

Built from this branch, GARbro opened every retail archive of Ero-On!, Homu Plus, Sena Plus, Rikka Plus and Nyaru Plus:

• Each game was detected automatically from its executable. Oreimo Plus was detected too.
• All 5,124 entries decrypted without errors.
• Every entry matches an independent extractor byte for byte.