feat: integrate real Carla host with JACK support and add plugin abstraction layer

client/src/plugins.h

@@ -0,0 +1,22 @@
+#ifndef PLUGINS_H
+#define PLUGINS_H
+
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* All functions return -1 on error, 0 on success (except plugin_load which returns 0 on success and sets *out_id) */
+
+int plugin_load(const char *binary, const char *plugin_id, int *out_id);
+int plugin_unload(int id);
+int plugin_connect(int id, const char *port_name, const char *looper_port);
+int plugin_disconnect(const char *from, const char *to);
+void plugin_set_bypass(int id, bool bypass);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif