Moved move, moveEmplace, and forward to core.lifetime.

Author: TurkeyMan

changelog/emplace.dd

@@ -1,3 +1,4 @@
-Moved `std.conv.emplace` to core/lifetime.d
+Moved `std.conv.emplace`, `std.algorithm.mutation.move`, and `std.functional.forward` to core/lifetime.d
 
 `emplace` is the counterpart to `destroy`, so it has been moved to also live in druntime (core/lifetime.d) where it is accessible by projects that use a shallow runtime library stack.
+`move` and `forward` are related low-level construction machinery which also belong in `core.lifetime`.

src/core/internal/traits.d

@@ -203,7 +203,7 @@ template anySatisfy(alias F, T...)
 }
 
 // simplified from std.traits.maxAlignment
-private template maxAlignment(U...)
+template maxAlignment(U...)
 {
     static if (U.length == 0)
         static assert(0);
@@ -220,7 +220,7 @@ private template maxAlignment(U...)
 }
 
 // std.traits.Fields
-private template Fields(T)
+template Fields(T)
 {
     static if (is(T == struct) || is(T == union))
         alias Fields = typeof(T.tupleof[0 .. $ - __traits(isNested, T)]);
@@ -325,3 +325,11 @@ template staticMap(alias F, T...)
                 staticMap!(F, T[$/2 ..  $ ]));
     }
 }
+
+// std.exception.assertCTFEable
+version (unittest) package(core)
+void assertCTFEable(alias dg)()
+{
+    static assert({ cast(void) dg(); return true; }());
+    cast(void) dg();
+}