No catenary mast track & placeable masts

Adds tracks without catenary posts and individually placeable masts. This allows you to fix junctions with misplaced masts on the tracks. 1. Upgrade the problem track to the mast free tracks. Zoom in and hold shift when upgrading tracks to select the smallest section possible. Can be a little fiddly selecting the right section to remove the masts, sometimes you have to select an adjacent track to remove them. 2. Head to the decoration menu and manually place the required masts to complete.