[9849] Implement character database clean up.

[newsbot]

<pre>m sql/characters.sql
+ sql/updates/9849_01_characters_saved_variables.sql
m sql/updates/Makefile.am
+ src/game/CharacterDatabaseCleaner.cpp
+ src/game/CharacterDatabaseCleaner.h
m src/game/Makefile.am
m src/game/World.cpp
m src/game/World.h
m src/mangosd/mangosd.conf.dist.in
m src/shared/revision_nr.h
m src/shared/revision_sql.h
m win/VC100/game.vcxproj
m win/VC80/game.vcproj
m win/VC90/game.vcproj

[9849] Implement character database clean up.

This can be disabled by config option.

Flag for clean up can be set for example on client version change.

Signed-off-by: hunuza <hunuza@gmail.com></pre>



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