[9050] Add MAX_EXPANSION define for config option Expansion check.

[newsbot]

<pre>m src/game/SharedDefines.h
m src/game/World.cpp
m src/shared/revision_nr.h

[9050] Add MAX_EXPANSION define for config option Expansion check.

This will prevent case when expansion set to high for supported client
in config and account have also too high expansion setting.
Client in like case receive too high expnasion and reject connection
because it think that have not installed expansion for connection account.

This possible for example for account case when single realmd used for
diff client versions and account have high expansion setting for most
recent client support. And in same time mamngos.conf for specific realm
have wrong Expansion value.</pre>



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