Implement more EVT opcodes

Implement more EVT opcodes

We implement (exposing unused server members for them):
* CHECK_MONSTER_CHALLENGE_TIME
* CHECK_ITEMCHANGE_NUM
* CHECK_MIDDLE_STATUE_NOCAPTURE
* CHECK_MIDDLE_STATUE_CAPTURE
* CHECK_NO_CASTLE (loading KNIGHTS_SIEGE_WARFARE for this info)
* CHECK_CASTLE (loading KNIGHTS_SIEGE_WARFARE for this info)
* CHECK_MONSTER_CHALLENGE_USERCOUNT
* CHECK_BEEF_ROAST_KARUS_VICTORY
* CHECK_BEEF_ROAST_ELMORAD_VICTORY
* CHECK_BEEF_ROAST_NO_VICTORY

Refs #260

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