Add basic build and inject scripts

Linux-only for now.

.gitignore

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+Vencord

build.sh

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+#!/usr/bin/env bash
+
+set -euo pipefail
+
+# Pull the patches repository
+git pull
+
+# Do we have the Vencord sources cloned?
+if [ -e Vencord/.git ]; then
+	# Update sources
+	cd Vencord
+	git fetch
+else
+	# Clone sources
+	git clone https://github.com/Vendicated/Vencord.git Vencord
+	cd Vencord
+fi
+
+# Reset vexcord branch and apply patches
+git checkout -B vexcord origin/main
+git am ../*.patch
+
+# Build vencord
+pnpm i --frozen-lockfile
+node scripts/build/build.mjs

inject.sh

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+#!/usr/bin/env bash
+
+set -euo pipefail
+
+# Wraps the string in quotes, and escapes quotes, backslashes, and newlines.
+jsonescape() {
+	sed -e 's|[\\"]|\\&|g' -e 's|\n|\\n|g' -e 's/^\|$/"/g'
+}
+
+discord=""
+if [ "$#" -ge 1 ]; then
+	discord="$1"
+else
+	# Find where the system installation of Discord is.
+	for path in \
+		/opt/discord \
+		/opt/discord-ptb \
+		/opt/discord-canary \
+		/usr/share/discord \
+		/usr/share/discord-ptb \
+		/usr/share/discord-canary; do
+		if [ -d "$path" ]; then
+			discord="$path"
+			break
+		fi
+	done
+	if [ -z "$discord" ]; then
+		echo "Could not find your system installation of Discord!" 2>&1
+		echo "Please pass the path to your Discord installation:" 2>&1
+		echo "  $0 [path_to_discord]" 2>&1
+		exit 1
+	fi
+fi
+
+if [ ! -e "$discord/resources" ]; then
+	echo "Directory does not exist: $discord/resources" 2>&1
+	exit 1
+elif [ ! -w "$discord/resources" ]; then
+	echo "Can't write to directory: $discord/resources" 2>&1
+	echo "If you're installing Vexcord to your system Discord installation," 2>&1
+	echo "try running this script as root. (e.g. using sudo)" 2>&1
+	exit 1
+fi
+
+# Move app.asar to _app.asar
+if [ -f "$discord/resources/app.asar" ]; then
+	mv -T "$discord/resources/app.asar" "$discord/resources/_app.asar"
+elif [ ! -d "$discord/resources/app.asar" ]; then
+	echo "Missing app.asar!" >&2
+	echo "Try reinstalling discord." >&2
+	exit 1
+fi
+
+# Make our own fake app.asar that just points to the Vencord patcher.
+mkdir -p "$discord/resources/app.asar"
+echo "require($(realpath Vencord/dist/patcher.js | jsonescape))" >"$discord/resources/app.asar/index.js"
+echo '{"main": "index.js", "name": "discord"}' >"$discord/resources/app.asar/package.json"
+
+echo "Installed Vexcord to: $discord"