Update and fix on research and map, Diplomacy update

Hello!

As my first post, I want to share some ideas I got.

1:

On research (tree),in Soviet one, there should be T-34/85 instead of T-44 and T-44 should be instead of T-5? .

Also, in German one, there should be Stug III in Tank Destroyer research.

2:

About research,too. All countries research tree should contain secret projects, like You are able to choose either tank, ship or plane. For example: German research tree contains Landkreuzers as secret projects for tanks. These projects are expensive and take 3-7 days to build, but they are very strong, while still ,for example, slow.

3:

In all maps, about Estonia, Narva province should be replaced with Tartu, as Tartu is(and was, too) bigger and more important than Narva.

4:

About diplomacy, there should be peace conferences, with option if both players/AI and player accept it starts conference. And of course, vassals should be too, but only as AI.

And there should be a way to make non-core other-core provinces to Your core provinces, too.

Thanks for reading and I'm ready for any questions!