Table conditional formatting improvements: better precision controls (greater than, less than, greater or equal, less or equal, equal, not)

When specifying a conditional formatting, we should have a better control of the colour gradients and precision on what colour constitutes what value. For example:

* RED: Less than 0.5
* AMBER: Equal or greater than 0.5, less than 0.8
* GREEN: Equal or greater than 0.8

We might also not want to have a gradient established throughout the scope of values -- and only work with fixed, "solid" colours instead.

We should basically allow conditional formatting to use: , ≥, ≤, =, ≠