CTimeOSD: use class konform member names

CTimeOSD is inherited from CComponentsForm/Item.
Therefore, it is usual to keep the functional layout.
Overwritable virtual members should be used with same
functionality. kill() is similar with paintBackground() known from
CFrameBuffer, hide(bool) do restore saved background and expects a
parameter.

TODO: It works, but class layout of CTimeOSD is currently not conform
with Components, because the functionalities are partially undermined
and must be reworked.
For Example: timescale and clock object not used as sub objects
in a parent form object.


Origin commit data
------------------
Commit: 7403aa2d46
Author: Thilo Graf <dbt@novatux.de>
Date: 2014-01-07 (Tue, 07 Jan 2014)

src/gui/timeosd.h

@@ -48,12 +48,13 @@ class CTimeOSD : public CComponentsFrmClock
 		void Init();
 		void initTimeString();
 		void updatePos(int position, int duration);
+		void KillAndResetTimescale();
 
 	public:
 		CTimeOSD();
-		~CTimeOSD();
+// 		~CTimeOSD(); is inherited
 		void show(time_t time_show, bool force = true);
-		void hide();
+		void kill();
 		bool IsVisible() {return m_mode != MODE_HIDE;}
 		void update(int position, int duration);
 		void switchMode(int position, int duration);