Add Baikal map (fixed) (#690)

## Description:
This PR adds the "Baikal" map which is a cutout from the whole real life
lake, as the lake itself is very large vertically and wouldn't make as a
very good map by itself. This map has some rivers and a very big sort of
water body that seperates the map in two(it was kind of designed for the
teams gamemode). It's nations are some features around that region.

## Please complete the following:

- [ ] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

Nikola123

resources/maps/Baikal.json

@@ -0,0 +1,73 @@
+{
+  "name": "Baikal",
+  "width": 2500,
+  "height": 1565,
+  "nations": [
+    {
+      "coordinates": [695, 665],
+      "name": "Irkutsk Oblast",
+      "strength": 2,
+      "flag": "bai_irk"
+    },
+    {
+      "coordinates": [2188, 1001],
+      "name": "Republic of Buryatia",
+      "strength": 2,
+      "flag": "bai_bur"
+    },
+    {
+      "coordinates": [754, 1170],
+      "name": "Olkhon Island",
+      "strength": 1,
+      "flag": "ru"
+    },
+    {
+      "coordinates": [1025, 831],
+      "name": "Cape Khoboy",
+      "strength": 1,
+      "flag": "ru"
+    },
+    {
+      "coordinates": [361, 1195],
+      "name": "Ogoi Island",
+      "strength": 1,
+      "flag": "ru"
+    },
+    {
+      "coordinates": [1805, 115],
+      "name": "Bolshoy Ushkan Island",
+      "strength": 1,
+      "flag": "ru"
+    },
+    {
+      "coordinates": [2030, 335],
+      "name": "Svyatoy Nos Peninsula",
+      "strength": 2,
+      "flag": "ru"
+    },
+    {
+      "coordinates": [2194, 659],
+      "name": "Chivyrkuisky Bay",
+      "strength": 1,
+      "flag": "ru"
+    },
+    {
+      "coordinates": [309, 230],
+      "name": "Chanchur",
+      "strength": 2,
+      "flag": "ru"
+    },
+    {
+      "coordinates": [2165, 1439],
+      "name": "Zabaykalsky National Park",
+      "strength": 1,
+      "flag": "ru"
+    },
+    {
+      "coordinates": [132, 751],
+      "name": "Listvyanka",
+      "strength": 1,
+      "flag": "ru"
+    }
+  ]
+}