Change the visuals of the counters in the top panel.
- Abbreviate large numbers (fixes #6063).
- Added popMax to the population counter.
- Also show 0 gatherers, highlights and changes the font.
Patch by: @Langbart
Differential revision: https://code.wildfiregames.com/D3911
Reviewed by: @Angen, @Freagarach
Comments by: @asterix, @nwtour, @s0600204, @wraitii