feat(rivet): storyboard composition with flexible lengths and meters

Rivet 0.4.0 tells a motif as a story. A timeline of blocks with roles
(statement, answer, departure, return, rest) replaces tasks, pins and
branches. Rivet writes each block from a motif and joins the seams with
a cut, breath, pickup or approach.

- Motifs of 1-8 bars in a bin of 16; storyboards up to 32 bars.
- Meters 2/4, 3/4, 4/4, 5/4, 6/8, 7/8 and 12/8 for import, writing,
  audition and export. Phrygian, harmonic minor and Mixolydian scales.
- Per-block options, Another take and Keep; templates for new boards.
- Editor rebuilt: motif bin, timeline, large piano roll, inspector,
  tabs for generation, harmony and sound roles, 32-step undo/redo.
- Sessions from 0.1-0.3 open as a storyboard from their source motif.

plugins/rivet/plugin/Cargo.lock

@@ -855,7 +855,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "39cab71617ae0d63f51a36d69f866391735b51691dbda63cf6f96d042b63efeb"
 dependencies = [
  "libc",
- "windows-sys 0.61.2",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -2054,7 +2054,7 @@ checksum = "d6f6ff9a378485b298a5286656da665ba74413d36db0979633275d2e708145d4"
 
 [[package]]
 name = "rivet"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "clap-sys",
  "nih_plug",
@@ -2067,7 +2067,7 @@ dependencies = [
 
 [[package]]
 name = "rivet-app"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "crossbeam-queue",
  "rivet-core",
@@ -2077,7 +2077,7 @@ dependencies = [
 
 [[package]]
 name = "rivet-core"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "serde",
  "serde_json",
@@ -2085,7 +2085,7 @@ dependencies = [
 
 [[package]]
 name = "rivet-midi"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "rivet-core",
 ]
@@ -2143,7 +2143,7 @@ dependencies = [
  "errno",
  "libc",
  "linux-raw-sys 0.12.1",
- "windows-sys 0.61.2",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -2329,7 +2329,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "230a1b821ccbd75b185820a1f1ff7b14d21da1e442e22c0863ea5f08771a8874"
 dependencies = [
  "rustix 1.1.6",
- "windows-sys 0.61.2",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -2617,7 +2617,7 @@ version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c2a7b1c03c876122aa43f3020e6c3c3ee5c05081c9a00739faf7503aeba10d22"
 dependencies = [
- "windows-sys 0.61.2",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]