REORG: include: move server.h to haproxy/server{,-t}.h

extern struct dict server_name_dict was moved from the type file to the
main file. A handful of inlined functions were moved at the bottom of
the file. Call places were updated to use server-t.h when relevant, or
to simply drop the entry when not needed.
diff --git a/src/backend.c b/src/backend.c
index 26e36ae..e4b677a 100644
--- a/src/backend.c
+++ b/src/backend.c
@@ -40,6 +40,7 @@
 #include <haproxy/payload.h>
 #include <haproxy/proxy.h>
 #include <haproxy/queue.h>
+#include <haproxy/server.h>
 #include <haproxy/session.h>
 #include <haproxy/ssl_sock.h>
 #include <haproxy/stream_interface.h>
@@ -54,7 +55,6 @@
 #include <haproxy/protocol.h>
 #include <haproxy/proto_tcp.h>
 #include <haproxy/sample.h>
-#include <proto/server.h>
 #include <proto/stream.h>
 
 #define TRACE_SOURCE &trace_strm