modules: 'rebase' from byterun_with_modules, initial impl, without verification

byterun/include/module_manager.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <stdint.h>
+
+#include "utils.h"
+
+struct ModSearchResult {
+  size_t symbol_offset;
+  uint32_t mod_id;
+  Bytefile *mod_file; // = NULL => not found
+};
+
+void mod_add_search_path(const char *path);
+
+Bytefile *mod_get(uint32_t id);
+
+int32_t find_mod_loaded(const char *name); // < 0 => not found
+
+int32_t mod_load(const char *name); // < 0 => not found
+
+uint32_t mod_add(Bytefile *module);
+
+struct ModSearchResult mod_search_pub_symbol(const char *name);