Backup the InputMethodContext operations

Backup the InputMethodContext operations

Backup the InputMethodContext operations such as "SetInputPanelLanguage", "AutoEnableInputPanel" and etc.

Previously, we had two problems
1. InputMethodContext ignores the options set before the actor is on a Window.
2. InputMethodContext resets its options after the actor changes its Window.

By storing operations when they are called and reapplying them after the actor is connected to Window,
the InputMethodContext can keep the options regardless of Window.

Change-Id: I5a607619a06de88d1c5202aa2d82f5fafc455c70
Signed-off-by: Jiyun Yang <ji.yang@samsung.com>