(svn r1817) -Codechange: Moved depot-functions to depot.c

-Codechange: Added wrappers around depot-access (GetDepot no exists)
-Codechange: Made depot-functions a bit more logic (no longer 
GetDepotByTile crashes your game when you request it on a non-depot tile)
-Add: made depots dynamic (yes, 64k depots are possible now)

ttd.vcproj

@@ -314,6 +314,9 @@
 			</File>
 			<File
 				RelativePath=".\dedicated.c">
+			</File>				
+			<File
+				RelativePath=".\depot.c">
 			</File>
 			<File
 				RelativePath="economy.c">
@@ -1163,6 +1166,9 @@
 			<File
 				RelativePath="debug.h">
 			</File>
+			<File
+				RelativePath="depot.h">
+			</File>
 			<File
 				RelativePath="economy.h">
 			</File>