[text] Added DrawFPSEx() with Color arg (READ DESCRIPTION)

[OkiStuff]

This Pull Request is aimed at adding a roadmap feature
See the roadmap here: #1523

On the raylib roadmap there was
text: Redesign DrawFPS() to support Color parameter like other draw functions. BREAKING CHANGE
But it doesn't have to break existing projects

We could have

// Draws current FPS
// NOTE: Uses default font
void DrawFPSEx(int posX, int posY, Color tint)
{
    DrawText(TextFormat("%2i FPS", GetFPS()), posX, posY, 20, tint);
}

(Note, this is what is in the PR)
So existing projects still work.
You can even add the size as a parameter

// Draws current FPS
// NOTE: Uses default font
void DrawFPSEx(int posX, int posY, int fontSize, Color tint)
{
    DrawText(TextFormat("%2i FPS", GetFPS()), posX, posY, fontSize, tint);
}

(Note, the code above is not in the actual PR, but if you do want to be able to change the fontSize, tell me in the comments and I will add it)

And if you want font support too

void DrawFPSEx(Font font, int posX, int posY, int fontSize, Color tint)
{
    if (font.texture.id != 0)
    {
       Vector2 pos = { (float)(posX), (float)(posY) };

        int defaultFontSize = 10;
        if (fontSize < defaultFontSize) fontSize = defaultFontSize;
        int spacing = fontSize/defaultFontSize;       

       DrawTextEx(font, TextFormat("%2i FPS", GetFPS()), pos, (float)(fontSize), (float)(spacing), tint);
    }
}

(Note, the code above is not in the actual PR, but if you do want to be able to change the font, tell me in the comments and I will add it)

[OkiStuff]

also little note
In

void DrawFPS(int posX, int posY)
{
    DrawText(TextFormat("%2i FPS", GetFPS()), posX, posY, 20, LIME);
}

the comment said

// Shows current FPS on top-left corner

but it shows the current FPS wherever the posX and posY is so I just changed it to

// Draws current FPS

to not have any confusion. You can change it back if you want

[raysan5]

@OkiStuff Finally I decided it was not required adding a new function to the API just for a functionality that user can do with a line of code, I mean, why adding several additional lines of code and the maintenance involved while user can do the same with just one line of code?

In any case, I'll review the comment.