Store each macro to its own file

[Alexey-T]

now: all macros are saved to 1 json.

not easy to move macros from 1 PC to another...

wish: on start, read old config, and MOVE all macros to separate .json files in settings/macros/.
make filenames like "macros/name_of_macro.json", name_of_macro is from old config, name_of_macro is not needed inside new json file.

on next starts, read OLD config + all NEW files settings/macros/*.json.

write all macros only to macros/*.json.