Rename _SwiftUINavigationState to SwiftUINavigationCore (pointfreeco#112)

* wip

* wip

Author: mbrandonw

Package.swift

@@ -16,8 +16,8 @@ let package = Package(
       targets: ["SwiftUINavigation"]
     ),
     .library(
-      name: "_SwiftUINavigationState",
-      targets: ["_SwiftUINavigationState"]
+      name: "SwiftUINavigationCore",
+      targets: ["SwiftUINavigationCore"]
     ),
   ],
   dependencies: [
@@ -27,17 +27,10 @@ let package = Package(
     .package(url: "https://github.com/pointfreeco/xctest-dynamic-overlay", from: "0.8.0"),
   ],
   targets: [
-    .target(
-      name: "_SwiftUINavigationState",
-      dependencies: [
-        .product(name: "CustomDump", package: "swift-custom-dump"),
-        .product(name: "XCTestDynamicOverlay", package: "xctest-dynamic-overlay"),
-      ]
-    ),
     .target(
       name: "SwiftUINavigation",
       dependencies: [
-        "_SwiftUINavigationState",
+        "SwiftUINavigationCore",
         .product(name: "CasePaths", package: "swift-case-paths"),
       ]
     ),
@@ -47,5 +40,12 @@ let package = Package(
         "SwiftUINavigation"
       ]
     ),
+    .target(
+      name: "SwiftUINavigationCore",
+      dependencies: [
+        .product(name: "CustomDump", package: "swift-custom-dump"),
+        .product(name: "XCTestDynamicOverlay", package: "xctest-dynamic-overlay"),
+      ]
+    ),
   ]
 )

Sources/SwiftUINavigation/Internal/Exports.swift

@@ -1,2 +1,2 @@
 @_exported import CasePaths
-@_exported import _SwiftUINavigationState
+@_exported import SwiftUINavigationCore

Sources/SwiftUINavigation/Switch.swift

@@ -1,5 +1,5 @@
 import SwiftUI
-@_spi(RuntimeWarn) import _SwiftUINavigationState
+@_spi(RuntimeWarn) import SwiftUINavigationCore
 
 /// A view that can switch over a binding of enum state and exhaustively handle each case.
 ///