Proposal: Structures to build sorted in tabs.

[Freagarach]

Currently all buildings which can be build by an entity are visible at once, which is nice (but can also be difficult due to building order switching). A real problem with this is when mods have many more buildings, the space gets way too small, so either smaller icons need to be made (that reduce visibility) or not all buildings can be shown.

Many games have different kind of buildings sorted in tabs, e.g. "Economic", "Military", "Eyecandy/Ornamental". While I think it would be an improvement for the base game, support for it would at least be useful for mods.

Possible problems if used in vanilla:

• One cannot see all buildings at once anymore.
• It may require an extra click (+ mouse movement) to select the building of your choice.
• Currently units trained by a building and structures built by a unit will show up next to eachother. That would also not be possible hereafter.

(This can in principle be expanded to units/technologies but that is less of a problem currently, I think.)