KAACK mod based on BF 4.3.3 (4.3.3_5)

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

Mod adds some fun/useful functionality to Betaflight 4.3, mainly for OSD.
Also RPM limiter which is OFF by default (turn it on for some SPEC racing)
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

Changes since the previous version:

1. Added RPM limiter
2. Undefined USE_ACRO_TRAINER and USE_OSD_STICK_OVERLAY to save some memory

Full list of changes:
4.3.1...KAACK_4.3.3_5

New since KAACK_4.3.1_4
KAACK_4.3.1_3...KAACK_4.3.3_5