(svn r8610) -Codechange/Feature: rewrote the list handling in the autoreplace window
-The user will notice the following changes:
All vehicle types behaves in the same way
Adding/removing an engine (new design and so on) can no longer result in the window selecting a new engine
All valid replacements will be displayed since it looks at refitting options as well (this solves the missing ships with the newships GRF)
Since you can't replace an engine into itself, the engine selected in the left list will no longer appear in the right list

-The code changes:
Instead of looping all engines all the time, each list generates a list like the build windows
This ensures consistent list generation since only one function can loop all engines
Unified code for all vehicle types
It now use the lists to call the drawing code in the build vehicle window
Works on selected EngineIDs instead of selected index in the list

(svn r8550) -Fix

Building a vehicle does not involve allocating orders, so do not check whether orders could be allocated

(svn r8538) -Fix

GetRoadStopByTile() cannot return NULL. Remove therefore unnecessary check

(svn r8474) -Fix

Turn GetPrimaryRoadStop() into a method of struct Station

(svn r8425) -Fix

Do not try to invalidate a window which just got deleted. It is pointless

(svn r8424) -Fix

Do not call ClearSlot() just before calling DeleteVehicle(), which does it too

(svn r8128) -Codechange: Split sprite and palette remap into separate 32 bit values.
This lets us increase the sprite width from 14 to up to 29 bits,
effectively nulling the old sprite limit. Table changes in next commit.