Add Liquidsoap version check

src/settings.liq

@@ -26,6 +26,13 @@ ini = read_ini(config)
 engine_config_folder = string.split(separator="/engine-core.ini", config)
 engine_config_folder = list.nth(default="../config/", engine_config_folder, 0)
 
+# VERSION CHECK
+liq_min_version = list.assoc(default="2.1", "liquidsoap_min_version", ini)
+if not liquidsoap.version.at_least(liq_min_version) then
+    print("AURA Engine Core requires at least Liquidsoap v#{liq_min_version}")
+    exit(1)
+end
+
 # ALLOW LIQUIDSOAP RUN AS ROOT
 lqs_allow_root = list.assoc(default="false", "liquidsoap_as_root", ini)
 if lqs_allow_root == "true" then