Removed temploraly class members in wxButton and wxTLW.

These members such as m_parentId and m_label were used for demonstrational purposes. Now as proper class implementation is being added base class should hold some of these.
Added parentId and id members to wxWindow.

These will be required by all Android wxWindow classes. m_parentId can be used only if window has parent.
Removed m_label from wxControl.

Now, only m_label exists in wxWindow/wxControl, in case of wxTLW, this will hold tittle, and in case of wxControl it will be label.
Added code to wxWindow's create.

This further removes any need for temploraly members and stores all data that will be required to call android methods in base class.