Revert "Do not add built plugins inside tundra/bin/plugins/[Release|RelWithDebInfo|Debug] when making Xcode project, but put all plugins in same folder" since the problem was in CMake

This reverts commit a6c49dabccea3c8daf126b6421b896e3e83afd1a.
Proper fix for placing up built targets in ./bin and ./bin/plugins
FIx boost build; Change SkyX and RenderSystem_GL install name to avoid linking errors; Make 64-bit a strict option in Xcode project
Make llvm.clang.1_0 default compiler in case of Snow Leopard (although still Xcode will use llvm.g++42)
Fixed rest of the deps directories in Mumble's and SkyXHydrax's CMakeLists.txt and cmake/ConfigurePackages.cmake
Added 'xcodebuild' command to start building in case of Xcode generated project
Moved all mac-specific scripts from 'tools' to 'tools/OSX'