v240114 - Camera controls revised

Recent reviews and discussions made me think about the camera controls again and I made some improvements. The camera in orbital view no longer automatically zooms out. Instead, when colliding with terrain, it will stop orbiting and start turning around. This gives a more pleasant and controlled experience. [list] [*] refined orbital camera controls [*] fixed the bug of zoom to mouse function with inverted mouse zoom [*] Deep mine I research is now unlocked by default. [*] fixed the save thumbnail bug. [*] copy building with MMB will copy the building along with recipe and upgrades [/list]