Allow running on Android 5.0 but with a warning that it's unsupported

* The apk targets api level 21 which is 5.0, so it still won't install on
  anything older.
* We pop up a big warning to the user the first time they try and select such a
  remote host.

qrenderdoc/Code/Interface/PersistantConfig.h

@@ -322,6 +322,9 @@ DECLARE_REFLECTION_STRUCT(BugReport);
                                                                                            \
   CONFIG_SETTING_VAL(public, int, int, Android_MaxConnectTimeout, 30)                      \
                                                                                            \
+  CONFIG_SETTING_VAL(public, QDateTime, rdcdatetime, UnsupportedAndroid_LastUpdate,        \
+                     rdcdatetime(2015, 01, 01))                                            \
+                                                                                           \
   CONFIG_SETTING_VAL(public, bool, bool, CheckUpdate_AllowChecks, true)                    \
                                                                                            \
   CONFIG_SETTING_VAL(public, bool, bool, CheckUpdate_UpdateAvailable, false)               \
@@ -625,6 +628,14 @@ For more information about some of these settings that are user-facing see
 
   Defaults to ``30``.
 
+.. data:: UnsupportedAndroid_LastUpdate
+
+  A date containing the last time that the user was warned about an Android device being older than
+  is generally supported. This prevents the user being spammed if they consistently use an old
+  Android device. If it has been more than 3 weeks since the last time an old device was seen, we
+  re-warn the user, but if it's less than 3 weeks we silently update this date so continuous use
+  doesn't nag.
+
 .. data:: CheckUpdate_AllowChecks
 
   ``True`` if when coloring marker regions in the :class:`EventBrowser`, the whole row should be