RENAMED: ImageDrawTriangleEx() to ImageDrawTriangleGradient()

For consistency with the new `DrawTriangleGradient()`

Author: raysan5

src/raylib.h

@@ -1429,7 +1429,7 @@ RLAPI void ImageDrawRectangleV(Image *dst, Vector2 position, Vector2 size, Color
 RLAPI void ImageDrawRectangleRec(Image *dst, Rectangle rec, Color color);                                // Draw rectangle within an image
 RLAPI void ImageDrawRectangleLines(Image *dst, Rectangle rec, int thick, Color color);                   // Draw rectangle lines within an image
 RLAPI void ImageDrawTriangle(Image *dst, Vector2 v1, Vector2 v2, Vector2 v3, Color color);               // Draw triangle within an image
-RLAPI void ImageDrawTriangleEx(Image *dst, Vector2 v1, Vector2 v2, Vector2 v3, Color c1, Color c2, Color c3); // Draw triangle with interpolated colors within an image
+RLAPI void ImageDrawTriangleGradient(Image *dst, Vector2 v1, Vector2 v2, Vector2 v3, Color c1, Color c2, Color c3); // Draw triangle with interpolated colors within an image
 RLAPI void ImageDrawTriangleLines(Image *dst, Vector2 v1, Vector2 v2, Vector2 v3, Color color);          // Draw triangle outline within an image
 RLAPI void ImageDrawTriangleFan(Image *dst, const Vector2 *points, int pointCount, Color color);         // Draw a triangle fan defined by points within an image (first vertex is the center)
 RLAPI void ImageDrawTriangleStrip(Image *dst, const Vector2 *points, int pointCount, Color color);       // Draw a triangle strip defined by points within an image

src/rtextures.c

@@ -3806,7 +3806,7 @@ void ImageDrawTriangle(Image *dst, Vector2 v1, Vector2 v2, Vector2 v3, Color col
 }
 
 // Draw triangle with interpolated colors within an image
-void ImageDrawTriangleEx(Image *dst, Vector2 v1, Vector2 v2, Vector2 v3, Color c1, Color c2, Color c3)
+void ImageDrawTriangleGradient(Image *dst, Vector2 v1, Vector2 v2, Vector2 v3, Color c1, Color c2, Color c3)
 {
     // Calculate the 2D bounding box of the triangle
     // Determine the minimum and maximum x and y coordinates of the triangle vertices