publish 2.3.0-31

Include commits (from old to new):

1. 70ca46e8 (Gen19) DB 2.44
2. 26c40dd2 (Feb20)
3. 8b91d17b (Feb20)
4. d7a94466 (Feb21)
5. 7170b009 (Feb21)
6. 09eed1fc (Feb21)
7. 281ab82d (Feb22)
8. 05f6b621 (Mar2)
9. ca9af9d4 (Mar9)
10. 9ca70adf (Mar16) fix some races behaviour (xpadullés) #813 (closed)
11. d8d8b75e (Mar16) fix race analyzer export (with triggers?). This commit seems to fix also this issue: #805 (closed)
12. 837bb4ff (Mar21) (have a tar.gz of cherrypicks)
13. 103fef7e (Mar21) (have a tar.gz of cherrypicks)
14. acab7b61 (Mar21) chromebook
15. 103fef7e (Mar21) chromebook
16. 837bb4ff (Mar21) chromebook
17. 96f6b160 (Mar22) chromebook
18. 900d4183 (Mar23)
19. 66e1054d (Mar24)
20. fa1ea560 (Mar30)
21. c31a562f (Mar30)

Discarded:

• (it is related to new gtk3 preferences window: fix of ffmpeg call problems on some window (in a new window or redirect stdin)
• Duplicated repetitions after capture in linear encoder #809 (seems related to bad manual hacked db on xpadulles laptop)
• 1dd1dae4 (Mar21) lots of conflicts on preferences