core: merge oak-common into oak-core

oak-common is gone; its modules (configstore, xmlutils, ocioutils,
oiioutils, colormath, colortransform, videoparams, ffmpegutils, ...)
now live in oak-core alongside the value types. The render value/GPU
types moved too: backend (wgpu context + DisplayRenderer), color
(ColorProcessor over ocio-rs), texture, frame, and the commonutil
config helpers.

Fix-ups to make the merged tree build and pass tests:

- oak-core Cargo.toml: wgpu back to 25 (the moved backend code is
  written against that API generation); add the toml/quick-xml/image
  deps oak-common carried.
- lib.rs: drop the duplicate 'pub mod error;'.
- error.rs: unified OAKCORE_* codes; restore Error::new() and
  From<OcioError> from oak-common's error type.
- backend.rs/color.rs: oak_core::/oak_render:: self-references
  rewritten to crate::; the shaderfx-dependent GPU effect test moved
  to oak-render's shaderfx tests (shaderfx depends on oak-node and
  cannot live in oak-core).
- oak-render's error module re-exports oak_core::error::{Error,
  Result}; the OAKRENDER_* codes stay as the public-code contract.
- oak-node jobs.rs: ColorProcessor imported from oak_core::color.
- Integration tests repointed at oak_core::{texture, frame, backend,
  color, colormath}.
- the display-ICC regression test treats an empty OAK_DISPLAY_ICC as
  unset, matching displayicc::env_override_icc.

Cargo.lock

@@ -4158,9 +4158,9 @@ dependencies = [
 
 [[package]]
 name = "log"
-version = "0.4.33"
+version = "0.4.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ceec5bc11778974d1bcb055b18002eba7f4b3518b6a0081b3af5f21666da9ad"
+checksum = "f9f8bd3e56ce4dfc153cf470fffbfa98c7620958b312ca5c3a4b8d5181fd13c6"
 dependencies = [
  "serde_core",
  "value-bag",
@@ -4732,7 +4732,6 @@ dependencies = [
  "log",
  "oak-audio",
  "oak-codec",
- "oak-common",
  "oak-core",
  "oak-node",
  "oak-plugin",
@@ -4753,7 +4752,6 @@ dependencies = [
  "cpal",
  "ffmpeg-next",
  "oak-codec",
- "oak-common",
  "oak-core",
  "oak-ffmpeg-link",
  "thiserror 2.0.20",
@@ -4765,7 +4763,6 @@ version = "0.5.0"
 dependencies = [
  "clap",
  "oak-codec",
- "oak-common",
  "oak-core",
  "oak-node",
  "oak-render",
@@ -4778,29 +4775,24 @@ name = "oak-codec"
 version = "0.5.0"
 dependencies = [
  "ffmpeg-next",
- "oak-common",
  "oak-core",
  "oak-ffmpeg-link",
  "thiserror 2.0.20",
 ]
 
 [[package]]
-name = "oak-common"
+name = "oak-core"
 version = "0.5.0"
 dependencies = [
  "image",
  "log",
- "oak-core",
  "ocio-rs",
  "quick-xml 0.41.0",
  "thiserror 2.0.20",
  "toml 0.8.23",
+ "wgpu 25.0.2",
 ]
 
-[[package]]
-name = "oak-core"
-version = "0.5.0"
-
 [[package]]
 name = "oak-ffmpeg-link"
 version = "0.5.0"
@@ -4810,7 +4802,6 @@ name = "oak-node"
 version = "0.5.0"
 dependencies = [
  "oak-codec",
- "oak-common",
  "oak-core",
  "oak-undo",
  "thiserror 2.0.20",
@@ -4846,7 +4837,6 @@ dependencies = [
  "libc",
  "naga 25.0.1",
  "oak-codec",
- "oak-common",
  "oak-core",
  "oak-node",
  "ocio-rs",
@@ -4861,7 +4851,6 @@ name = "oak-storage"
 version = "0.5.0"
 dependencies = [
  "chrono",
- "oak-common",
  "oak-core",
  "oak-node",
  "oak-otio",
@@ -4878,7 +4867,6 @@ name = "oak-task"
 version = "0.5.0"
 dependencies = [
  "oak-codec",
- "oak-common",
  "oak-core",
  "oak-node",
  "oak-otio",
@@ -4891,7 +4879,6 @@ dependencies = [
 name = "oak-timeline"
 version = "0.5.0"
 dependencies = [
- "oak-common",
  "oak-core",
  "oak-node",
  "oak-undo",
@@ -4911,7 +4898,6 @@ version = "0.5.0"
 dependencies = [
  "libc",
  "oak-codec",
- "oak-common",
  "oak-core",
  "oak-node",
  "oak-plugin",
@@ -7566,7 +7552,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "32497e9a4c7b38532efcdebeef879707aa9f794296a4f0244f6f69e9bc8574bd"
 dependencies = [
  "fastrand 2.5.0",
- "getrandom 0.3.4",
+ "getrandom 0.4.3",
  "once_cell",
  "rustix 1.1.4",
  "windows-sys 0.61.2",