Move TOOLS_HOLDER into tools/ folder

Also clean up some compiler warnings

3d-viewer/3d_cache/dialogs/panel_prev_3d.h

@@ -39,7 +39,7 @@
 #include "panel_prev_3d_base.h"
 
 #include <vector>
-#include <tools_holder.h>
+#include <tool/tools_holder.h>
 #include <3d_canvas/eda_3d_canvas.h>
 #include <3d_viewer_id.h>
 #include <3d_rendering/ctrack_ball.h>

3d-viewer/3d_canvas/board_adapter.h

@@ -768,6 +768,8 @@ class EDA_3D_BOARD_HOLDER
 public:
     virtual BOARD_ADAPTER& GetAdapter() = 0;
     virtual CCAMERA&       GetCurrentCamera() = 0;
+
+    virtual ~EDA_3D_BOARD_HOLDER() {};
 };
 
 #endif // BOARD_ADAPTER_H

common/CMakeLists.txt

@@ -331,7 +331,6 @@ set( COMMON_SRCS
     status_popup.cpp
     systemdirsappend.cpp
     template_fieldnames.cpp
-    tools_holder.cpp
     trace_helpers.cpp
     undo_redo_container.cpp
     utf8.cpp
@@ -381,6 +380,7 @@ set( COMMON_SRCS
     tool/tool_base.cpp
     tool/tool_dispatcher.cpp
     tool/tool_event.cpp
+    tool/tools_holder.cpp
     tool/tool_interactive.cpp
     tool/tool_manager.cpp
     tool/tool_menu.cpp

common/tool/tools_holder.cpp

@@ -26,8 +26,8 @@
 #include <tool/action_manager.h>
 #include <tool/action_menu.h>
 #include <tool/actions.h>
+#include <tool/tools_holder.h>
 #include <tool/tool_manager.h>
-#include <tools_holder.h>
 
 
 TOOLS_HOLDER::TOOLS_HOLDER() :

include/eda_base_frame.h

@@ -46,7 +46,7 @@
 #include <frame_type.h>
 #include <hotkeys_basic.h>
 #include <kiway_holder.h>
-#include <tools_holder.h>
+#include <tool/tools_holder.h>
 #include <widgets/ui_common.h>
 
 // Option for main frames

include/tool/tools_holder.h

@@ -66,6 +66,8 @@ protected:
 public:
     TOOLS_HOLDER();
 
+    virtual ~TOOLS_HOLDER() { }
+
     /**
      * Return the MVC controller.
      */