Refactoring: Added dependency info about subprojects in the top level…

… project file replacing the 'ordered' kludge - now we can build any of the subprojects by specifying the target - e.g. 'make server' to build drone

ost.pro

@@ -1,11 +1,20 @@
 TEMPLATE = subdirs
-CONFIG += ordered
-SUBDIRS = \
-    extra \
-    rpc/pbrpc.pro \
-    common/ostproto.pro \
-    common/ostprotogui.pro \
-    server/drone.pro \
-    client/ostinato.pro \
-    binding/binding.pro
+SUBDIRS = client server ostproto ostprotogui rpc binding extra
 
+client.target = client
+client.file = client/ostinato.pro
+client.depends = ostproto ostprotogui rpc extra
+
+server.target = server
+server.file = server/drone.pro
+server.depends = ostproto rpc
+
+ostproto.file = common/ostproto.pro
+
+ostprotogui.file = common/ostprotogui.pro
+ostprotogui.depends = extra
+
+rpc.file = rpc/pbrpc.pro
+
+binding.target = binding
+binding.depends = ostproto