Add SetComputerBarrier

[kubaau]

Adds SetComputerBarrier LUA function which works like !GLOBAL_SET_COMPUTER_BARRIER did in S2 RTX scripts. This makes it possible to script old campaigns much more simply than with the tools previously available.

[kubaau]

Force-pushed clang-tidy fix:

-for(auto bldSite : bldSites)
+for(noBuildingSite* bldSite : bldSites)

[Flow86]

Force-pushed clang-tidy fix:

-for(auto bldSite : bldSites)
+for(noBuildingSite* bldSite : bldSites)

you still can use auto - but you have to use auto* bldSite : bldSites) to make tidy happy

[Spikeone]

It'd be great to: have this in multiplayer (if that doesn't already work), for players and a "lift" function as well, that way one could "nicely" block a player in a custom campaign

[kubaau]

It'd be great to: have this in multiplayer (if that doesn't already work), for players and a "lift" function as well, that way one could "nicely" block a player in a custom campaign

This implementation only works for AIs. Implementing this for each player (or lifting restrictions) would not be difficult, but this particular implementation is only basically a mirror of S2 campaign AI behavior.