The previous location was the return from the first ets_printf call
that prints ROM sign-on message. Since the main function was patched
in ECO3, the new address no longer works — there is no instruction at
0x40007901 in ECO3 ROM. This could be solved by setting two
breakpoints (one would work for ECO <=2, the other for ECO3), but we
would need to remove the unused breakpoint later.
Fix this by setting the breakpoint at ets_printf. This means that when
debugging a loadable ELF the ROM sign-on message will no longer be
shown, but this doesn't seem to be an issue.
loadable elf example is different for 2 reasons:
1. loadable elf binary don't have flasher_args.json, so we can't use normal
to get from CI artifacts
2. it don't have binary and don't need to downloaded binary to DUT. Some
related functions can be ignored
Refactor IDF "project" functionality under a wrapping of the default
"project" command, so we can tweak it a bit...
Will need more testing in other environments.
