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Move str_search to util.c, update some function with this method.

Fix a bug when the blocker is about to be chipped to death, the attack takes damage instead.

Hmm, forgot extern in openbor_getentity, add it.

A type mistake, fixed.

Script method getentity allow get an entity handle by index from ent_list.

Also ent_max is available through openborvariant, it stands for the max index of the entity list + 1, should save some loops.

updateframe, setidle, performattack method for script. Less tricky than changeentityproperty.

Give star code a patch, if there still be problem, just tell the modder to use shotframe instead in jumpattack.

Remove those un-used code from script engine.

Big change in ScriptVariant.
Now it use a shared string cache so the memory usage is cut down slightly.

Therefore when give copy value or change type, use functions declared in ScriptVariant.h instead of directly change.

rush_count, rush_tally and rush_time are now all accessible.