Add system time configuration (#4043)

* Add setting to switch between a fixed start time and the system time

Add clock settings to SDL

Make clock configureable in qt

Add a SharedPage handler class

Init shared_page_handler for tests

src/citra/default_ini.h

@@ -199,6 +199,15 @@ is_new_3ds =
 # -1: Auto-select (default), 0: Japan, 1: USA, 2: Europe, 3: Australia, 4: China, 5: Korea, 6: Taiwan
 region_value =
 
+# The clock to use when citra starts
+# 0: System clock (default), 1: fixed time
+init_clock =
+
+# Time used when init_clock is set to fixed_time in the format %Y-%m-%d %H:%M:%S
+# set to fixed time. Default 2000-01-01 00:00:01
+# Note: 3DS can only handle times later then Jan 1 2000
+init_time =
+
 [Camera]
 # Which camera engine to use for the right outer camera
 # blank (default): a dummy camera that always returns black image