The dumpObject function in wren_debug.c was incorrectly printing "[fn %p]" for
OBJ_RANGE objects instead of the correct "[range %p]" label. This fix ensures
that range objects are properly identified during debug output.
Separate Wren VM library sources from CLI tool sources by moving them into
src/vm/ and src/cli/ subdirectories respectively. Update the Makefile to use
separate wildcard patterns for each directory, generate distinct object file
paths under build/vm/ and build/cli/, and adjust include paths to src/include.
Also update the Xcode project file to reference the new file locations.
