Added Profiler.cake to handle both profiling cases

When 'Profile isn't defined, the null/stub profiler macros will be
used. When it is defined, macros that generate Tracy zones/tags will
be used.

src/Profiler.cake

@@ -0,0 +1,6 @@
+(export-and-evaluate
+ (comptime-cond
+  ('Profile ;; TODO: Different defines for different profilers
+   (import "Tracy.cake"))
+  (true
+   (import "ProfilerNull.cake"))))