Bitrunning hotfix 3 (#78818)

## About The Pull Request
The next round of small changes to how bitrunning works - mostly from
feedback, bug reports etc.

- The loot crate delivery spot is now a buildable machine (the
byteforge), making it replaceable in the event of a disaster
- Same for netpods and quantum consoles. These boards are now
researchable and buildable.
- New icons for the byteforge and the health monitor
- Some bug fixes around despawning avatars
- Reimplements one of the bitrunning unit tests

<details>
<summary>Pictures ⬇️</summary>

Host monitor

![hostmon](https://github.com/tgstation/tgstation/assets/42397676/dc6811bc-7ce9-4eae-a91b-96975bd13c65)

Byteforge

![dreamseeker_LewhZG8bEl](https://github.com/tgstation/tgstation/assets/42397676/3071bc5f-b2c1-47d5-8a56-b0e6c216be20)

Spawning a crate

![dreamseeker_mHGSfoeMu5](https://github.com/tgstation/tgstation/assets/42397676/d5f84e91-b9bc-4bb8-8f1c-f8931154ff6d)
</details>

## Why It's Good For The Game
Bitrunning bug fixes and personal requests
Fixes #78571 
Fixes an issue reported in discord - players stuck as gondola spawn

## Changelog
🆑
fix: Added extra checks to bitrunning domain cleanup so avatars are
deleted properly.
add: Quantum servers now look for a new machine called a byteforge to
spawn loot on- no longer on an invisible landmark. This should make the
rooms rebuildable after disasters.
add: *Most* bitrunning machinery is now researchable and buildable via
circuits in the engineering protolathe.
/🆑

code/modules/unit_tests/_unit_tests.dm

@@ -100,6 +100,7 @@
 #include "baseturfs.dm"
 #include "bespoke_id.dm"
 #include "binary_insert.dm"
+#include "bitrunning.dm"
 #include "blindness.dm"
 #include "bloody_footprints.dm"
 #include "breath.dm"