strncpy() does not enforce NUL-termination, but snprintf() does. So we need to ensure all strings are terminated. Another issue was the use of the wrong length parameter for these functions, resulting in the limiting arguments not being applied to the right length.
In most cases, _extern_address was unused, thus wasting cycles & RAM. This
adds a separate class BlockParamExt with the field and uses it in ekf2_main
Frees roughly 0.5KB of RAM on Pixracer
Daniel Agar