Improve config system

Add pkl to generate configs

config/emgauwa-controller.pkl

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+amends "./lib/controller.pkl"
+
+server {
+	host = "127.0.0.1"
+	port = 4419
+}
+
+database = "sqlite://_local/emgauwa-controller.sqlite"
+
+permissions {
+	user = "emgauwa"
+	group = "emgauwa"
+}
+
+logging {
+	level = "DEBUG"
+	file = "stdout"
+}
+
+relays {
+	new {
+		driver = "gpio"
+		pin = 5
+		inverted = true
+	}
+	new {
+		driver = "gpio"
+		pin = 4
+		inverted = true
+	}
+	new {
+		driver = "gpio"
+		pin = 3
+		inverted = true
+	}
+	new {
+		driver = "gpio"
+		pin = 2
+		inverted = true
+	}
+	new {
+		driver = "gpio"
+		pin = 1
+		inverted = true
+	}
+	new {
+		driver = "gpio"
+		pin = 0
+		inverted = true
+	}
+	new {
+		driver = "gpio"
+		pin = 16
+		inverted = true
+	}
+	new {
+		driver = "gpio"
+		pin = 15
+		inverted = true
+	}
+	new {
+		driver = "piface"
+		pin = 1
+		inverted = false
+	}
+	new {
+		driver = "piface"
+		pin = 0
+		inverted = false
+	}
+}

config/emgauwa-core.pkl

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+amends "./lib/core.pkl"
+
+server {
+	host = "127.0.0.1"
+	port = 4419
+}
+
+database = "sqlite://_local/emgauwa-core.sqlite"
+
+permissions {
+	user = "emgauwa"
+	group = "emgauwa"
+}
+
+logging {
+	level = "DEBUG"
+	file = "stdout"
+}

config/lib/common.pkl

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+class ServerConfig {
+	host: String
+	port: UInt16
+}
+
+/// Set to a user and a group to drop privileges to after binding to the port
+class PermissionsConfig {
+	user: String
+	group: String
+}
+
+class LoggingConfig {
+	level: String
+	file: String
+}

config/lib/controller.pkl

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+import "./common.pkl"
+
+server: common.ServerConfig
+
+database: String
+
+permissions: common.PermissionsConfig
+
+logging: common.LoggingConfig
+
+class RelayConfig {
+	driver: "gpio" | "piface"
+	pin: Number
+	inverted: Boolean
+}
+relays: Listing<RelayConfig>

config/lib/core.pkl

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+import "./common.pkl"
+
+server: common.ServerConfig
+
+database: String
+
+permissions: common.PermissionsConfig
+
+logging: common.LoggingConfig
+
+/// Leave empty to allow all origins (will always respond with Origin and not "*")
+origins: Listing<String>