Add custom widget element to mbMainWindow.ui for multiblock inspector
Needed for linux build, which is case sensitive. Without the element, the Qt/UIC code generates the header in lowercase text. macOS is cool with that but linux/gcc wont buy it.
Needed for linux build, which is case sensitive. Without the element, the Qt/UIC code generates the header in lowercase text. macOS is cool with that but linux/gcc wont buy it.