Initial Vec2 impl ready for algo

src/custom_types.h

@@ -23,6 +23,15 @@ struct LatLng {
     float lng_;
 };
 
+struct Vec2 {
+    float x_;
+    float y_;
+};
+
+Vec2 eqRectProjection(const LatLng target, const LatLng ref);
+Vec2 abMidpoint(const Vec2 A, const Vec2 B);
+float abSqDist(const Vec2 A, const Vec2 B);
+
 struct TrackData {
     uint16_t magic_ = CONFIG_MAGIC;
     unsigned short id_;
@@ -31,6 +40,12 @@ struct TrackData {
     LatLng point_b_;
 };
 
+struct GlobalTrackData {
+    bool loaded = false;
+    Vec2 center_;
+    TrackData root_;
+};
+
 struct GpsSubData {
     uint32_t age_;
     bool valid_;