Inclusive language problems

[Saviq]

Across the repository the following terms were highlighted as potentially insensitive:

 [error] `crazy` may be insensitive, use `baffling`, `unexplained`, `errant` instead  (1 count)
 [error] `dMZ` may be insensitive, use `perimeter network`, `passthrough network` instead  (1 count)
 [error] `dummy` may be insensitive, use `placeholder`, `sample` instead  (8 counts)

1. "crazy" - a github username, not something we have control over https://github.com/MirServer/wlcs/blob/70af53d0d062198679a09c0524cac5d6b0bc91bf/.github/workflows/ppa-upload.yml#L30
2. "DMZ" is the cursor theme, we could switch to the Ubuntu Yaru theme instead
3. "dummy" in variable names and comments, easily replaced https://github.com/MirServer/wlcs/blob/70af53d0d062198679a09c0524cac5d6b0bc91bf/src/thread_proxy.h#L309-L312 https://github.com/MirServer/wlcs/blob/70af53d0d062198679a09c0524cac5d6b0bc91bf/tests/self_test.cpp#L181-L183
4. "graphics-dummy.so", referring to the example platform, will follow MirServer/mir#2501