Strip down the build to fit into 4MB flash

[bs-github]

Make the 4MB build working.

The 4MB build is too big at the moment to be flashable onto 4MB hardware.

Solution I think is most likely

Probably the project does not fit into 4MB twice (for OTA falshing) so the OTA part could be taken out to make it work. For that there should be a no_ota_4MB_coredump.csv and maybe the OTA flashing disabled in the backend.

see: https://github.com/warp-more-hardware/esp32-firmware/blob/master/software/warpAC011K.ini#L87

[env:warpAC011K4mb]
extends = env:warpAC011K
board_build.partitions = default_4MB_coredump.csv

[bs-github]

To shrink the firmware, it worked out to leave out the

custom_backend_modules
                         ;Mqtt
                         ;Modbus Tcp
                         ;Wireguard
                         ;Ocpp
custom_frontend_modules
                         ;Wireguard
                         ;Mqtt
                         ;Modbus Tcp
                         ;Ocpp