Переименование s0 -> s, x1 -> x, x2 -> y, x3 -> z, что должно упростить читаемость кода. Также обновление документации

docs/vector3-eng.md

@@ -1,21 +1,21 @@
 # Three-dimensional vectors
 
 There are two types of 3D vectors in the library:
-- **BgcVector3FP32** - vector using single-precision floating-point numbers
-- **BgcVector3FP64** - vector using double-precision floating-point numbers
+- **BGC_FP32_Vector3** - vector using single-precision floating-point numbers
+- **BGC_FP64_Vector3** - vector using double-precision floating-point numbers
 
 Structure definitions:
 
 ```c
     typedef struct
     {
-        float x1, x2, x3;
-    } BgcVector3FP32;
+        float x, y, z;
+    } BGC_FP32_Vector3;
 
     typedef struct
     {
-        double x1, x2, x3;
-    } BgcVector3FP64;
+        double x, y, z;
+    } BGC_FP64_Vector3;
 ```
 
 ## Functions