[WIP] Trevally Tutorials (for TDWs UI)

[Trevally.]

@Vlad

One more note re. OHII v.1.4: tried to play the '4 bearings' training mission, but no enemy contact was spotted. The U-boat was positioned at 25 m depth at the same place for quite a long time, but neither me nor my sonarguy could hear something interesting. In main campaign with the same mod configuration the hydrophone is working correctly

I have just tested this and if you use the Tutorial for OHII it should work.
Ensure you select "the four bearing" from the tutorial menu.
Then click historical missions - See post 2 for more info on how to start a tutorial.

The four bearing tutorial is split into part:-
Map work (parallel lines etc)
The four bearing (demo by me on map)
The hunt (a step by step guide to T4Bearings as it happens) ***this is where a real ship will appear for you to track
Fast90 attack with real nav (using the info to possition for a fast 90)