KAACK mod based on BF 4.3.1 (4.3.1_2)

Use with caution, at your own risk!
Only for experienced Betaflight users!

What is KAACK mod and how to use it:
https://www.youtube.com/watch?v=CdkTQ9QeDlQ

Changes since the previous version:

1. Remove KAACK security, now 100% throttle KAACK is available without a password :)
2. Changed defaults for max_check. Now it is 1950, not 1900 (to have better throttle resolution by default).
3. Activates KAACK OSD stats by default (make sure you got throttle percentage in your OSD).

Mod adds some fun functionality to Betaflight 4.3, mainly for OSD.

Changes some default values of BF.4.3
Adds a bunch of different post-flight statistics such as average throttle, total KAACK time, etc.
Allows changing some warnings text for OSD via CLI. (use ONLY UPPERCASE!)
Adds QUICK OSD menu
Includes DJI OSD hack

To get the list of new features, open CLI and type
get extra

Full list of changes:
4.3.1...KAACK_4.3.1_2

New since KAACK_4.3.1_1
KAACK_4.3.1_1...KAACK_4.3.1_2