Tab controller

[Hirogen]

This pull request refactors the tab management logic in the LogTabWindow class to use a new TabController abstraction, replacing direct manipulation of the _logWindowList and dockPanel contents. This change centralizes tab/window operations, simplifies event handling, and improves code maintainability. Additionally, extension methods for clipboard text formatting have been moved and modernized.

Tab management refactor:

• Introduced a TabController to handle all tab/window operations in LogTabWindow, replacing direct use of _logWindowList and dockPanel.Contents. All window addition, removal, activation, and iteration now go through TabController. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14]
• Added event handler methods (OnTabControllerWindowAdded, OnTabControllerWindowRemoved, OnTabControllerWindowActivated, OnTabControllerWindowClosing) to respond to tab/window events, improving separation of concerns and encapsulation.

Code cleanup and modernization:

• Removed the obsolete _logWindowList and related locking logic throughout LogTabWindow, simplifying window tracking and concurrency management. [1] [2] [3] [4] [5] [6] [7]
• Updated methods such as SwitchTab, SelectTab, GetListOfOpenFiles, SaveLastOpenFilesList, FindWindowForFile, and RemoveLogWindow to use the new TabController API. [1] [2] [3] [4] [5] [6]

Extension methods update:

• Moved ToClipBoardText extension methods for ILogLine and ILogLineMemory from LogLineExtensions.cs to a new Extensions.cs file, using the new C# extension syntax and namespace. [1] [2]

Minor code improvements:

• Added and updated comments/documentation for several methods to clarify their purpose and usage. [1] [2] [3]
• Minor formatting and whitespace adjustments in various files for readability. [1] [2] [3]

These changes make tab/window management more robust and maintainable, and modernize extension method usage.