`KillWeapon` lacks of consideration for damage without a source

[TaranDahl]

Description

The first DetonateAt should function normally without a source.
The arg pAttackerHouse in ReceiveDamage should be used.
They only derive the source house from the techno source at this time.

Phobos Version

Any

Conditions to reproduce

No response

INI code

Steps to reproduce

No need to reproduce.

Expected behaviour

pAttackerHouse is used if there is no source.

Actual behaviour

pAttackerHouse is never used.

Additional context

No response

Checklist

• The issue happens on the latest official version of Phobos and wasn't fixed yet.
• I agree to elaborate the details if requested and provide thorough testing if the bugfix is implemented.
• I added a very descriptive title to this issue.
• I used the GitHub search and read the issue list to find a similar issue and didn't find it.
• I have attached as much information as possible (screenshots, gifs, videos, debug and exception logs, etc).

[TaranDahl]

@Coronia Maybe you could handle this problem. IIRC KillWeapon is a feature you developed.