GNUmakefile: prefer "check_" prefix instead of "test_"

- Reserve "test" for tests & testing frameworks.
- Add "check_mypy" to "make help" text.
- Output to the standard output instead of redirecting to log-files,
  leave redirecting output log-files to the user running the command.

GNUmakefile

@@ -51,12 +51,6 @@ Testing Targets
 
    * test:
      Run automated tests with ctest.
-   * test_cmake:
-     Runs our own cmake file checker
-     which detects errors in the cmake file list definitions
-   * test_pep8:
-     Checks all python script are pep8
-     which are tagged to use the stricter formatting
 
 Static Source Code Checking
    Not associated with building Blender.
@@ -72,6 +66,10 @@ Static Source Code Checking
                             using one of the accepted licenses in 'doc/license/SPDX-license-identifiers.txt'
                             Append with 'SHOW_HEADERS=1' to show all unique headers
                             which can be useful for spotting license irregularities.
+   * check_cmake:           Runs our own cmake file checker which detects errors in the cmake file list definitions.
+   * check_pep8:            Checks all Python script are pep8 which are tagged to use the stricter formatting.
+   * check_mypy:            Checks all Python scripts using mypy,
+                            see: source/tools/check_source/check_mypy_config.py scripts which are included.
 
 Spell Checkers
    This runs the spell checker from the developer tools repositor.
@@ -399,16 +397,6 @@ package_archive: .FORCE
 test: .FORCE
 	@$(PYTHON) ./build_files/utils/make_test.py "$(BUILD_DIR)"
 
-# run pep8 check check on scripts we distribute.
-test_pep8: .FORCE
-	@$(PYTHON) tests/python/pep8.py > test_pep8.log 2>&1
-	@echo "written: test_pep8.log"
-
-# run some checks on our CMAKE files.
-test_cmake: .FORCE
-	@$(PYTHON) build_files/cmake/cmake_consistency_check.py > test_cmake_consistency.log 2>&1
-	@echo "written: test_cmake_consistency.log"
-
 
 # -----------------------------------------------------------------------------
 # Project Files
@@ -486,7 +474,6 @@ check_descriptions: .FORCE
 	@$(BLENDER_BIN) --background -noaudio --factory-startup --python \
 	    "$(BLENDER_DIR)/source/tools/check_source/check_descriptions.py"
 
-# run deprecation tests, see if we have anything to remove.
 check_deprecated: .FORCE
 	@PYTHONIOENCODING=utf_8 $(PYTHON) \
 	    source/tools/check_source/check_deprecated.py
@@ -496,6 +483,14 @@ check_licenses: .FORCE
 	    "$(BLENDER_DIR)/source/tools/check_source/check_licenses.py" \
 	    "--show-headers=$(SHOW_HEADERS)"
 
+check_pep8: .FORCE
+	@PYTHONIOENCODING=utf_8 $(PYTHON) \
+	    tests/python/pep8.py
+
+check_cmake: .FORCE
+	@PYTHONIOENCODING=utf_8 $(PYTHON) \
+	    build_files/cmake/cmake_consistency_check.py
+
 
 # -----------------------------------------------------------------------------
 # Utilities