Ignore old cmake, VisualGDB working & Espressif sdkconfig files

.gitignore

@@ -404,3 +404,13 @@ async
 
 # Generated user_settings_asm.h.
 user_settings_asm.h
+
+# VisualGD
+**/.visualgdb
+
+# Espressif sdk config default should be saved in sdkconfig.defaults
+# we won't track the actual working sdkconfig files
+/IDE/Espressif/**/sdkconfig
+
+# auto-created CMake backups
+**/CMakeLists.txt.old