Small fixes

In the beginning of the intro level, mayor stood up automatically due to an AI mistake
in windowed mode, window size was reset to screen size on scene load
getting to climb ladder at the beginning of first mission was difficult, now player snaps to the ladder automatically
made it a bit more difficult to skip the climbing part of the tutorial
made cranes not useable since they're just confusing and I haven't figured out a way they'd be useful
walking over bodies is easier when ceiling is low
throwing indicator and "ready to throw" animation got stuck in some situations
preventing jumping when ceiling is low (to avoid some bugs)