// Allows Custom techs to be implemented.
public void AddCustomTech(string previousTechName)
{
tree.techTree.TryGetValue(previousTechName, out previous);
if (previous == null)
return;
// Resize the array to allow new tech.
Tech[] temp = new Tech[next.Length - 1];
next.CopyTo(temp, 0);
next = new Tech[temp.Length + 1];
temp.CopyTo(next, 0);
next[next.Length-1] = this;
}