chore: release Anvil 0.3.0, Weld 0.3.0 and Braze 0.1.0

- Anvil 0.3.0: Ghost harmonics, Phone listen, Kick lock and the offset
  audition. Anvil now has a Kick sidechain input.
- Weld 0.3.0: delay spread display.
- Braze 0.1.0: first release.
- Mark the released items in docs/ideas.md and add Braze to the release
  table.

docs/weld/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Weld changelog
 
-## Unreleased
+## 0.3.0
 
 - Show the **delay spread**: how much the alignment's group delay changes
   between 500 Hz and 4 kHz, where listeners hear it best. Above 0.64 ms (the

docs/weld/README.md

@@ -1,7 +1,7 @@
 # Weld
 
 Weld fuses two bass layers so they add up instead of cancelling. Current version
-**0.2.0**.
+**0.3.0**.
 
 Bass patches are layered: a sub, one or more mid growls, a top. Where the layers
 overlap in the mids, they partly cancel. The causes are a polarity difference, a