sdbusplus: use shorter type aliases

The sdbusplus headers provide shortened aliases for many types.
Switch to using them to provide better code clarity and shorter
lines.  Possible replacements are for:
  * bus_t
  * exception_t
  * manager_t
  * match_t
  * message_t
  * object_t
  * slot_t

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ibd2a0b512bfb7caf65bfab64b271d194da520aac
diff --git a/softoff/mainapp.cpp b/softoff/mainapp.cpp
index 563ccd1..7ff90b0 100644
--- a/softoff/mainapp.cpp
+++ b/softoff/mainapp.cpp
@@ -33,7 +33,7 @@
     auto bus = sdbusplus::bus::new_default();
 
     // Add systemd object manager.
-    sdbusplus::server::manager::manager(bus, SOFTOFF_OBJPATH);
+    sdbusplus::server::manager_t(bus, SOFTOFF_OBJPATH);
 
     // Get default event loop
     auto event = sdeventplus::Event::get_default();