begin rework for js tests and hook examples

hook/tests/hookapi/wasm/root.c

@@ -0,0 +1,21 @@
+#include "api.h"
+
+int64_t hook(uint32_t reserved )
+{
+    int64_t x = float_set(0, 1234567890);
+    int64_t l = float_root(x, 2);
+    TRACEXFL(l);
+    int64_t i = float_int(l, 6, 1);
+
+    TRACEVAR(i);
+
+    ASSERT(i == 35136418286444ULL);
+
+
+    // RH TODO: more tests
+
+    accept (0,0,0); 
+    _g(1,1);   // every hook needs to import guard function and use it at least once
+    // unreachable
+    return 0;
+}