decoder: Use glycin for image loading expect SVG

This gives us sandboxed image decoding and others the
option to extend Loupe with other image formats.

Cargo.toml

@@ -9,26 +9,26 @@ license = "GPL-3.0-or-later"
 lto = true
 codegen-units = 1
 
+[features]
+disable-glycin-sandbox = []
+
 [dependencies]
 anyhow = { version = "1.0.66", features = ["backtrace"] }
 arc-swap = "1.6.0"
+async-channel = "1.8.0"
 env_logger = "0.10.0"
 futures = "0.3.25"
 gvdb-macros = "0.1.6"
 indexmap = "1.9.2"
 kamadak-exif = "0.5.5"
-lcms2 = "5.6.0"
 libgweather = "4.2.0"
 log = "0.4.17"
 once_cell = "1.16.0"
-rgb = "0.8.36"
-safe-transmute = "0.11.2"
 url = "2.3.1"
 
 # decoders
-image-rs = { package = "image", version = "0.24.6" }
-libheif-rs = "0.19.0"
-librsvg = { git = "https://gitlab.gnome.org/GNOME/librsvg.git" }
+librsvg = { git = "https://gitlab.gnome.org/GNOME/librsvg.git", rev = "51c80502b8474ec10c315da3559a049bdf4fe8f1" }
+glycin = { git = "https://gitlab.gnome.org/sophie-h/glycin.git" }
 
 [dependencies.ashpd]
 version = "0.4.0"