Change logic for creating roads after removing roadblocks and other road+building objects

[Sephirex95]

needs more logic and elegant solutions, tbc

[Sephirex95]

Basic algorithm to be employed here:

• If player is using an area remove and that area covers both 'only road' tiles and building+road tiles, remove the underneath road as well
• If player removes just a building, check if the building connects two road tiles - if true, leave the underneath road to not shatter the road networks
• if player removes aqueduct bridge :
  • if the area being removed includes pure road tiles, remove aqueuct + road tiles
  • the the are doesnt include any 'pure' road tiles, leave any road tiles under the aqueduct

[Sephirex95]

Fix road placing inconsistencies for palisade gates, aqueducts and park gates

[Sephirex95]

bump

Raising priority to tie up #1694 and #1566 into a neat lil bow ASAP