Revert "MacPorts support for Xcode build"

This reverts commit ebfaa114a60f89bc11fbe05692037f6e792b1664.
Revert "Fix Xcode build"

This reverts commit f0784197fb932dce105e93b9f6aaaf226f2f547a.
Revert "Ignore Xcode project/workspace user data"

This reverts commit ebd7a0e3afc0659e6355f4a8b503775e9e40ca07.