Feature Request: Add buildingFilter values support for cityFilter

[PLynx01]

Before creating

• This is NOT a gameplay feature from Civ VI, BNW, or outside - see Roadmap
• This is NOT a gameplay feature from Vanilla Civ V or from G&K - If so, it should be a comment in Missing features from Civ V - G&K #4697

Problem Description

Currently, selecting cities with buildings is limited to cities with world wonders. The additional conditional uniques usually don't work for that purpose.

Related Issue Links

No response

Desired Solution

We need to integrate the buildingFilter into cityFilter in order to select cities with built buildings.

Example:
[1] population [{in all cities} {Stadium}]

Adds 1 population to cities with Stadium building

Alternative Approaches

We can make new uniques with buildingFilter parameter in addition to cityFilter parameter.

However, this would be somewhat incompatible with the modding philosophy.

Additional Context

No response

[yairm210]

#3242