Update changelog

ChangeLog

@@ -1,3 +1,54 @@
+====== ChangeLog from 0.8 to 0.9 ======
+
+
+*Diagram editor :
+Improved QElectroTech speed (launch qet, open project, function)
+A drop-down list has been added to the toolbar to change the size of the resize handles.
+
+
+*Element Editor:
+The "keep visual rotation" property of element texts is editable from the element editor.
+Thanks to the work of antonioaja it is now possible to import a dxf directly from the element editor in a completely transparent way for the user.
+In the background QElectroTech uses the dxf2elmt software. https://qelectrotech.org/forum/viewtopic.php?id=2265 https://github.com/antonioaja/dxf2elmt
+Improved responsiveness when multiple shapes are selected or deleted, especially when working on a large converted DXF element.
+https://qelectrotech.org/forum/viewtopic.php?pid=16612#p16612
+
+*Other:
+Add a "side project" tab in the "about" window.
+In the general QElectroTech configuration, a drop down list allows to choose the scaling method for hdpi screens.
+Allow open polygons (i.e. polylines) when saving in dxf format.
+https://qelectrotech.org/forum/viewtopic.php?pid=16611#p16611
+
+Added 'Other' option for slave device contact type.
+https://github.com/qelectrotech/qelectrotech-source-mirror/pull/222
+https://qelectrotech.org/forum/viewtopic.php?id=2264
+
+*Logs:
+
+Added a QElapsedTimer to calculate the time used to reload the item collection.
+Improved QElapsedTimer to calculate the time used to reload the item collection in seconds instead of ms.
+Added Linux pc.gpu.RAM information, but requires mesa-utils dependency on the Linux OS.
+Added information about mounted disk volumes.
+Added CPU architecture for which Qt was compiled in the aboutqetdialog widget and in the logs.
+Added MSVC support to MachineInfo.
+Added RAM information on Windows of available RAM.
+Added QElectroTech version to the log file.
+
+
+
+* Elements collection :
+Improve collection 8274 elements in 1097 categories (i.e. 9371 files).
+
+
+
+* macOS :
+Fix sqlite3 database export on macOS, now I use macports with Digikam scripts instead off Homebrew Package Manager.
+See: https://invent.kde.org/graphics/digikam/-/tree/master/project/bundles/macports
+
+
+*Bug fix:
+see: https://git.tuxfamily.org/qet/qet.git/log/?h=0.8.1
+
 ====== ChangeLog from 0.7 to 0.8 ======