removed all variables named "string" for c# compatability (they should have never been called that in the first place

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THIS CHANGES THE LIBLATTICE CLIENT SIDE INTERFACE!
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affected commands are log, chat, schat and action.

variable string has been renamed to command_text.....

lattice_chat.string -> lattice_chat.chat_text
lattice_action.string -> lattice_action.action_text
lattice_schat.string -> lattice_schat.schat_text
lattice_log.string -> lattice_log.log_text