Restructure core:terminal for better Windows support

core/testing/runner.odin

@@ -214,10 +214,6 @@ runner :: proc(internal_tests: []Internal_Test) -> bool {
 		}
 	}
 
-	when ODIN_OS == .Windows {
-		console_ansi_init()
-	}
-
 	stdout := io.to_writer(os.stream_from_handle(os.stdout))
 	stderr := io.to_writer(os.stream_from_handle(os.stderr))
 
@@ -981,9 +977,5 @@ To partly mitigate this, redirect STDERR to a file or use the -define:ODIN_TEST_
 		fmt.assertf(err == nil, "Error writing JSON report: %v", err)
 	}
 
-	when ODIN_OS == .Windows {
-		console_ansi_fini()
-	}
-
 	return total_success_count == total_test_count
 }