Kicad manager: fix an issue when starting eeschema from its button: if the library editor was previously running, and if the quasimodal field editor dialog was called, eeschema did not start on Windows, or started but sometimes did not load the schematic project on Linux.
Enhancement : if a tool is running but is iconized, clicking on its button bring the window on screen. This was already the case on Linux, but on Windows, the iconized frame was staying iconized.