Add docs android widgets page

[leamir]

Adds a page that includes a list of Android Widgets (UI buttons) that are rendered directly in text, similar to GameText colors:

Should stay unmerged until widgets are added to assets.open.mp and a commit is made to change the URL in the doc file.

[hamzahadded71-commits]

public OnActorStreamOut(actorid, forplayerid)
{
new string[48];
format(string, sizeof(string), "Actor %d is now streamed out for you.", actorid);
SendClientMessage(forplayerid, 0xFFFFFFFF, string);
return 1;
}