Ported Survival01 to lua

There are three difficulties available, you can switch between them [here](https://github.com/OpenRA/OpenRA/pull/6934/files#diff-55fbe32fb7b1873068357932ff886578R1).

Still some open points, should...
- ~~I add map.png from the allied missions?~~
- you be able to build medis and spys from [barracks](https://github.com/OpenRA/OpenRA/pull/6934/files#diff-2d8fd8a8f219058709870221e874fd33R1240) (without tent) as well?
- the soviets [repair](https://github.com/OpenRA/OpenRA/pull/6934/files#diff-55fbe32fb7b1873068357932ff886578R282) their buidlings?
- come additional [paratroopers](https://github.com/OpenRA/OpenRA/pull/6934/files#diff-55fbe32fb7b1873068357932ff886578R308) and [naval transports](https://github.com/OpenRA/OpenRA/pull/6934/files#diff-55fbe32fb7b1873068357932ff886578R315)?
- the new secondary objectives ([1.](https://github.com/OpenRA/OpenRA/pull/6934/files#diff-55fbe32fb7b1873068357932ff886578R232) and [2.](https://github.com/OpenRA/OpenRA/pull/6934/files#diff-55fbe32fb7b1873068357932ff886578R233)) stay?

Pinging @NukemBro , who created this ~~minigame~~ mission.
`Map.Difficulty` will expose this according to https://github.com/OpenRA/OpenRA/wiki/Lua-API. You will still need to create some GUI so that players can actually access it.