Refactor alarm system and replace notification method

The old OpenVR overlays did not function for unknown reasons, and it was
not possible to get them to work.

With this a white overlay with ALARM ACTIVATED will be shown for 3 seconds.
It's not pretty, but it effectively communicates that an alarm has been
activated.

This fixes
https://github.com/OpenVR-Advanced-Settings/OpenVR-AdvancedSettings/issues/417

build_scripts/qt/resources.pri

@@ -14,6 +14,7 @@ DISTFILES += \
     src/res/img/audio/microphone/ptt_notification.svg \
     src/res/img/battery/* \
     src/res/img/icons/* \
+    src/res/img/alarm/* \
     src/res/img/video/* \
     src/res/img/chaperone/* \
     src/res/qml/qmldir \

build_scripts/qt/sources.pri

@@ -22,6 +22,7 @@ SOURCES += src/main.cpp\
     src/keyboard_input/input_parser.cpp \
     src/settings/settings.cpp \
     src/settings/settings_object.cpp \
+    src/alarm_clock/vr_alarm.cpp \
 
 
 
@@ -61,7 +62,8 @@ HEADERS += src/overlaycontroller.h \
     src/settings/internal/settings_controller.h \
     src/settings/internal/specific_setting_value.h \
     src/settings/settings_object.h \
-    src/settings/internal/settings_object_data.h
+    src/settings/internal/settings_object_data.h \
+    src/alarm_clock/vr_alarm.h \
 
 
 win32 {