EditorManager: Move close split button updating to editor areas

No need to have editor manager being responsible for that.

Change-Id: I25f06a38fc2a543749fa1f10a7fa3f2e37c60cf0
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Vcs*: Rename several *Editors to *EditorWidgets

Follow suit.

Change-Id: If22452a5e46d62d419ba273981b1f247f5095b53
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
CppEditor: Remove some pointer indirection in timer access

Change-Id: Id2531b7841a0a173f07f7310fb0dc434ac5ec5f8
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>
GlslEditor: Also camel-case the namespace

Follows the general pattern better.

Change-Id: I5eaa6fb003d3b78c006f2500bba28c7cb92f623b
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
Options: Fix restoring last page for "delayed" created categories

E.g. when opening Designer > Forms, restarting Qt Creator and opening
options dialog again.

Change-Id: I0cfabed8c9e7ef8c98abab5490181223558e21a2
Reviewed-by: Christian Stenger <christian.stenger@digia.com>