Update MessageWriter to AnyCPU build.
Update MessageWriter to AnyCPU build.

rewdmister4/rewd-mod-packs,81ninja/DarkMultiPlayer,RockyTV/DarkMultiPlayer,RockyTV/DarkMultiPlayer,dsonbill/DarkMultiPlayer,godarklight/DarkMultiPlayer,Sanmilie/DarkMultiPlayer,Dan-Shields/DarkMultiPlayer,godarklight/DarkMultiPlayer,Kerbas-ad-astra/DarkMultiPlayer,81ninja/DarkMultiPlayer