CMake: use bf_io_ prefix for IO tests

This simplifies running built-in IO tests with:

  ctest -R bf_io_

Also use "bf_io_" prefix for the libraries since it was already used
by some and it's a useful hint the libraries are used for IO.

tests/python/collada/CMakeLists.txt

@@ -39,7 +39,7 @@ endif()
 # GENERAL PYTHON CORRECTNESS TESTS
 macro(COLLADA_TEST module test_name blend_file)
   add_test(
-    NAME collada_${module}_${test_name}
+    NAME bf_io_collada_${module}_${test_name}
     COMMAND "$<TARGET_FILE:blender>" ${TEST_BLENDER_EXE_PARAMS} ${TEST_SRC_DIR}/collada/${module}/${blend_file}
     --python ${CMAKE_CURRENT_LIST_DIR}/${module}/test_${module}_${test_name}.py --
     --testdir ${TEST_SRC_DIR}/collada/${module}