Simplified the uiTable cell layout stuff a bit: rather than implying that a cell layout can be used by multiple columns, just have the column *be* the cell layout.
Simplified the uiTable cell layout stuff a bit: rather than implying that a cell layout can be used by multiple columns, just have the column *be* the cell layout.

ProtonMail/libui,ProtonMail/libui,ProtonMail/libui