udf, mux: post-1.7.7 fixes for UDF chains, AAC headers and codec framing

UDF validates allocation-descriptor chains, maps fragmented metadata
files and tolerates broken subdirectory chains. The muxer holds headers
until every AAC track has its AudioSpecificConfig and backpatches a late
CodecPrivate. HEVC PPS tables are bounded, DTS EXSS aligned and MPEG
free-format frames capped. A no-media drive is released before the next
candidate opens; CI builds freemkv's app as a consumer.

.github/workflows/ci.yml

@@ -214,12 +214,8 @@ jobs:
           freemkv-i18n = { path = "../freemkv-i18n" }
           EOF
           done
-      # Since freemkv 1.7.6 the `freemkv` consumer's Linux target compiles a
-      # GTK4 + libadwaita desktop shell, so `cargo test` on it needs the
-      # pkg-config dev headers the `gtk4-sys`/`glib-sys` build.rs scripts
-      # probe. Kept local (not in the shared reusable) — only freemkv links
-      # against GTK; adding the deps to every consumer would tax the six
-      # that don't.
+      # freemkv's app build (`--features gui`) compiles a GTK4 + libadwaita
+      # shell, so testing it needs these pkg-config dev headers.
       - name: Install GTK4 + libadwaita development headers (for freemkv)
         run: |
           sudo apt-get update
@@ -242,6 +238,8 @@ jobs:
         working-directory: freemkv-engine
       - run: cargo test --tests
         working-directory: freemkv
+      - run: cargo test --tests --features gui
+        working-directory: freemkv
       - run: cargo test --tests
         working-directory: autorip
       - run: cargo test --tests