Move meta and random to "aux" modules.

Wren now has three classes of modules:

- The one magic "core" module that's built in and always needed.
- Auxiliary libraries like "meta" and "random". These do not have any
  dependencies, so can be used even when you embed Wren inside an
  application. But they're also optional and can be disabled if you
  don't need them.
- CLI modules. These ones need libuv and are tied to the CLI wrapper
  around the VM.

src/cli/modules.c

@@ -4,7 +4,6 @@
 #include "modules.h"
 
 #include "io.wren.inc"
-#include "random.wren.inc"
 #include "scheduler.wren.inc"
 #include "timer.wren.inc"
 
@@ -16,12 +15,6 @@ extern void fileClose(WrenVM* vm);
 extern void fileDescriptor(WrenVM* vm);
 extern void fileReadBytes(WrenVM* vm);
 extern void fileSize(WrenVM* vm);
-extern void randomAllocate(WrenVM* vm);
-extern void randomSeed0(WrenVM* vm);
-extern void randomSeed1(WrenVM* vm);
-extern void randomSeed16(WrenVM* vm);
-extern void randomFloat(WrenVM* vm);
-extern void randomInt0(WrenVM* vm);
 extern void stdinReadStart(WrenVM* vm);
 extern void stdinReadStop(WrenVM* vm);
 extern void schedulerCaptureMethods(WrenVM* vm);
@@ -105,16 +98,6 @@ static ModuleRegistry modules[] =
       STATIC_METHOD("readStop_()", stdinReadStop)
     END_CLASS
   END_MODULE
-  MODULE(random)
-    CLASS(Random)
-      STATIC_METHOD("<allocate>", randomAllocate)
-      METHOD("seed_()", randomSeed0)
-      METHOD("seed_(_)", randomSeed1)
-      METHOD("seed_(_,_,_,_,_,_,_,_,_,_,_,_,_,_,_,_)", randomSeed16)
-      METHOD("float()", randomFloat)
-      METHOD("int()", randomInt0)
-    END_CLASS
-  END_MODULE
   MODULE(scheduler)
     CLASS(Scheduler)
       STATIC_METHOD("captureMethods_()", schedulerCaptureMethods)