Spiffsgen: A Code Generation Based Workaround for Lack of ESP32 SPIFFS Uploader Tool

This tool will create a C++ .ino file to flash to an ESP32. The .ino file contains other files embedded as arrays in source code, along with a stub that writes the embedded files to the SPIFFS filesystem, which it creates if necessary. The upshot is it's a guaranteed way to insert files into your flash because the File Uploader tool does not work properly with the ESP32.