Deprecate package-framework

Advise users to use the plugin

attools/src/PackageFramework.swift

@@ -39,6 +39,8 @@ class PackageFramework: Tool {
         #endif
     }
     func run(task: Task, toolchain: String) {
+        print("Warning: package-framework is deprecated and will be removed.  Use the plugin instead.")
+        sleep(5)
         compiler_crash() //work around a compiler crash
 
         guard let moduleMapType = task[Options.ModuleMapType.rawValue]?.string else {

attools/src/atllbuild.swift

@@ -511,6 +511,7 @@ final class ATllbuild : Tool {
         let swiftCPath: Path
         if let c = task[Options.SwiftCPath.rawValue]?.string {
             print("Warning: \(Options.SwiftCPath.rawValue) is deprecated and will be removed in a future release of atbuild.  Use --toolchain to specify a different toolchain, or --platform when bootstrapping to a different platform.")
+            sleep(5)
             swiftCPath = Path(c)
         }
         else {