Add functionality to the multilayer select toolbar

[H-Barati]

The multilayer select plugin is a widely used tool in qgis. It can be made more popular by adding new features to it. In qgis, there is no tool to delete and rotate selected features from different layers simultaneously. This is possible by increasing the functionality of the multilayer select plugin. Therefore, the following suggestions are made.

1. Deleting selected features from different layers: This option was added by one of my friends to the multilayer select plugin, which you can use. It is suggested to display the list of features before deleting them in order to avoid user error.
   multilayerselect.Delet.zip
2. Rotating selected features from different layers: According to my studies, there is currently no tool in QGis that can rotate multiple selected features from different layers together around a user-specified rotation point. The rotate tool does this, but it rotates all the features of the layers, but our goal is to rotate the selected features. Considering that the multilayer select plugin has the possibility to select features from different layers, it is enough to design a tool that takes a point for the rotation center from the user and rotates all the features together according to the given angle. It is recommended to display the list of selected features before rotation.
3. An option can be added to the select features tool from the multilayer select plugin, which, like the identify feature tool in qgis, will display its features list when right-clicking on the map, so that the user can select any of the features he wants.
   At the same time, the layer should be activated after selection.