Build configuration fix

This is probably the most controversial change the Paratext team has made to Palaso.
Because Publishing Assistant needs a 64-bit build, we need to build a 64-bit version of Palaso so that we can build a 64-bit version of some Paratext shared DLLs. What we did is change the AnyCPU build configuration to actually build for AnyCPU and added an explicit x86 build configuration for both debug and release builds.
I was unsure what you all wanted for the Mono build configurations, so they were left alone (I hope).