Should be put in the reproduction tab.

My idea is:

• when that tab is enabled there would be numbers above all the cell hexes showing the growing order
• and there would be a list in that tab for the cells that will be added it would be something like "1. Stem at 0,0 2. Some other cell type at 0,1" etc. And the list would have buttons or drag and drop support for reordering
• and finally there would be a right click context menu to swap any cell and the first cell in a colony, that way the initial cell type to play as can also be swapped. This isn't really critical but would make it more obvious the colony is built around the cell in division order with number 1
• changing the order should not allow the colony to have holes in it while growing. So each cell starting from number 1 needs to be connected to a previous number so a line line 1-3-2 should be disallowed. Probably should have a button to fix this automatically as it might be annoying to manually fix.

Similar to: #1622