- remove any reference to sept and parsing of it
- completely refactor and simplify keygen
- use new Atmo tsec keygen for 7.0.0 and up
- simplify all info/tools that depend on hos keygen and bis keys
gcc 10 no longer lets you get away with not externing global variables in header files. This adds the necessary extern and adds defines in appropriate c files
By using `BOOT_CFG_AUTOBOOT_EN` in `boot_cfg` and `EXTRA_CFG_NYX_UMS` in `extra_cfg` you can launch UMS from boot.
The `ums` variable must be populated with one of the following:
```
NYX_UMS_SD_CARD 0
NYX_UMS_EMMC_BOOT0 1
NYX_UMS_EMMC_BOOT1 2
NYX_UMS_EMMC_GPP 3
NYX_UMS_EMUMMC_BOOT0 4
NYX_UMS_EMUMMC_BOOT1 5
NYX_UMS_EMUMMC_GPP 6
```
