Add Discord RPC support

If someone has Discord and Keypunch open at the same time, their
Keypunch activity will now show up in Discord using its rich presence
API. For some reason, Builder doesn't like the new folder access
requirements, so I've added a new one that grants access to the specific
folders needed to do this.

Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+discord-presence = "1.4.1"
 gettext-rs = { version = "0.6", features = ["gettext-system"] }
 gvdb-macros = "0.1.12"
 i18n-format = "0.2.0"

build-aux/dev.bragefuglseth.Keypunch.DiscordAccess.json

@@ -0,0 +1,86 @@
+{
+    "id" : "dev.bragefuglseth.Keypunch.Devel",
+    "runtime" : "org.gnome.Platform",
+    "runtime-version" : "master",
+    "sdk" : "org.gnome.Sdk",
+    "sdk-extensions" : [
+    	{
+    	     "id" : "org.freedesktop.Sdk.Extension.rust-stable",
+    	     "version" : "24.08"
+    	}
+    ],
+    "command" : "keypunch-wrapper.sh",
+    "finish-args" : [
+        "--share=network",
+        "--share=ipc",
+        "--socket=fallback-x11",
+        "--device=dri",
+        "--socket=wayland",
+        "--filesystem=xdg-run/app/com.discordapp.Discord:create",
+        "--env=RUST_BACKTRACE=1"
+    ],
+    "build-options" : {
+        "append-path" : "/usr/lib/sdk/rust-stable/bin",
+        "build-args" : [
+            "--share=network"
+        ],
+        "env" : {
+            "RUST_BACKTRACE" : "1",
+            "RUST_LOG" : "keypunch=debug"
+        }
+    },
+    "cleanup" : [
+        "/include",
+        "/lib/pkgconfig",
+        "/man",
+        "/share/doc",
+        "/share/gtk-doc",
+        "/share/man",
+        "/share/pkgconfig",
+        "*.la",
+        "*.a"
+    ],
+    "modules" : [
+    	{
+	  "name": "blueprint-compiler",
+	  "buildsystem": "meson",
+	  "cleanup": ["*"],
+	  "sources": [
+	    {
+	      "type": "git",
+	      "url": "https://gitlab.gnome.org/jwestman/blueprint-compiler",
+	      "tag": "v0.14.0"
+	    }
+	  ]
+	},
+	{
+	    "name" : "keypunch-wrapper",
+	    "buildsystem" : "simple",
+	    "build-commands" : [
+	    	"install -Dm755 keypunch-wrapper.sh /app/bin/keypunch-wrapper.sh"
+	    ],
+	    "sources" : [
+	    	{
+            	    "type" : "script",
+            	    "dest-filename" : "keypunch-wrapper.sh",
+            	    "commands" : [
+            	    	"for i in {0..9}; do\ntest -S $XDG_RUNTIME_DIR/discord-ipc-$i || ln -sf {app/com.discordapp.Discord,$XDG_RUNTIME_DIR}/discord-ipc-$i;\ndone",
+            	    	"keypunch"
+            	    ]
+            	}
+	    ]
+	},
+        {
+            "name" : "keypunch",
+            "builddir" : true,
+            "buildsystem" : "meson",
+            "run-tests" : true,
+            "sources" : [
+                {
+                    "type" : "dir",
+                    "path" : ".."
+                }
+            ]
+        }
+    ]
+}