Distinguish between soon-to-cull and soon-to-dormant snitches

The problem is, the same color, ORANGE, is used for a snitch that will merely go dormant soon and a snitch that will soon cull entirely.

[Currently](https://github.com/Gjum/SnitchMod/blob/master/common/src/main/java/gjum/minecraft/civ/snitchmod/common/Renderer.java#L125), the snitch fields are colored as follows:

- Culled: RED
- Dormant: ORANGE
- Will be dormant soon (within 3 days) : ORANGE
- Will be dormant soon-ish (within 7 days) : YELLOW
- Healthy: GREEN

We probably need a new stage, culling soon(-ish?), to be shown 3/7 days before the snitch culls. Probably 7. At the same time, we should remove the intermediate dormant soon stage, for consistency:

- Culled: RED
- Will be culled soon-ish (within 7 days) : ORANGE
- Dormant: YELLOW
- Will be dormant soon-ish (within 7 days) : ??? (PURPLE? BLUE?)
- Healthy: GREEN

This way we have a single pre-dormant and a single pre-cull stage, with each being active 7 days prior. I think that should be consistent and intuitive. Just need to find a new color for the dormant soon-ish stage. Logically it'd be a color between green and yellow.

Alternatively, we could find a new, fitting color for any of the other stages.