Add notifications: Inspiration/Eurekas, Border/Pop growth

[0SirLoin]

Especially in the late game and with the added popups for having reached inspiration and eureka limits one often misses a lot of this information. Would it be possible to have an option to convert these popups to these permanent infos on the right screen where you can choose when to read them (like having a dow, unit attacked, unit killed etc.)
Also on that matter another suggestion: Like in the community mod pack for Civ5 having such notifications for border growth and population growth would be very helpful because when playing with a lot of cities you often miss these events.

[chaorace]

From what I've gathered, true custom notifications are actually pretty hard to implement! I'll look into it again after v0.7

[chaorace]

This will be tackled in #514