Add TimerMetronomeWindow and WorkspaceWindow classes

- Introduced TimerMetronomeWindow.h and WorkspaceWindow.h to manage workspace windows and timer metronome functionality.
- Implemented WorkspaceWindow.cpp with methods for managing window visibility, collapsing, and workspace clearing/restoration.
- Removed obsolete snippets.cpp file containing unused code and functions.

src/UserInterfaceManager.cpp

@@ -17,8 +17,8 @@
  * along with this program. If not, see <https://www.gnu.org/licenses/>.
 **/
 
-#include "OutputPreviewWindow.h"
-#include "RenderView.h"
+#include "Window/OutputPreviewWindow.h"
+#include "View/RenderView.h"
 #include "RenderingManager.h"
 #include <string>
 #define PLOT_ARRAY_SIZE 180
@@ -57,14 +57,14 @@
 #include "defines.h"
 #include "Settings.h"
 #include "Log.h"
-#include "SystemToolkit.h"
-#include "DialogToolkit.h"
-#include "BaseToolkit.h"
-#include "NetworkToolkit.h"
-#include "GlmToolkit.h"
-#include "GstToolkit.h"
-#include "ImGuiToolkit.h"
-#include "ImGuiVisitor.h"
+#include "Toolkit/SystemToolkit.h"
+#include "Toolkit/DialogToolkit.h"
+#include "Toolkit/BaseToolkit.h"
+#include "Toolkit/NetworkToolkit.h"
+#include "Toolkit/GlmToolkit.h"
+#include "Toolkit/GstToolkit.h"
+#include "Toolkit/ImGuiToolkit.h"
+#include "Visitor/ImGuiVisitor.h"
 #include "ControlManager.h"
 #include "ActionManager.h"
 #include "Resource.h"
@@ -72,13 +72,13 @@
 #include "SessionCreator.h"
 #include "Mixer.h"
 #include "Recorder.h"
-#include "SourceCallback.h"
-#include "MediaSource.h"
-#include "PatternSource.h"
-#include "DeviceSource.h"
-#include "ShaderSource.h"
-#include "ScreenCaptureSource.h"
-#include "MultiFileSource.h"
+#include "Source/SourceCallback.h"
+#include "Source/MediaSource.h"
+#include "Source/PatternSource.h"
+#include "Source/DeviceSource.h"
+#include "Source/ShaderSource.h"
+#include "Source/ScreenCaptureSource.h"
+#include "Source/MultiFileSource.h"
 #include "ShmdataBroadcast.h"
 #include "VideoBroadcast.h"
 #include "MultiFileRecorder.h"