SD.open() new feature for creating all folders in path (#5721)

* SD.open() new feature for creating all folders in path

This PR adds to the SD.open() function option to create all folders to the file.

SD.open(const char* path, const char* mode, const bool create)

Default value of create is false.
When true folders are created.

From issue #5019

* Update vfs_api.cpp

memccpy -> memcpy

* File f = open() edit

added false for create

libraries/SPIFFS/src/SPIFFS.cpp

@@ -39,7 +39,7 @@ SPIFFSImpl::SPIFFSImpl()
 
 bool SPIFFSImpl::exists(const char* path)
 {
-    File f = open(path, "r");
+    File f = open(path, "r",false);
     return (f == true) && !f.isDirectory();
 }