PIDKiln v1.3 - mostly bugfix release

• fixed more issues created with FS/SPIFFS changes in ESP32 2.0.x framework (graph where missing data, logs and csv where not filled with data)
• fixed grave bug in program subroutine (it had too low priority to work reliable - causing slow updates, and not reliable execution of the program itself)
• fixed MAC address display (was shown in reversed order), add some new chip information to debug screen
• fixed some more possible memory errors in freeing memory
• cleaned/fixed html language and encoding definitions
• add web server simple error handling