fix: general equality (=) for all types, add type predicates & collection fns, test suite docs

- Fix: = now uses cljEqual/cljMultiEqual instead of numeric-only cljNumEq,
  so (= :a :a), (= "a" "a"), (= [1 2] [1 2]), (= nil nil) etc return true
- Fix: ns forms inside unwrapped (do ...) are skipped instead of emitting
  broken Nim comments inside cljRepr()
- Fix: defmacro forms go to defs section, not wrapped in discard cljRepr()
- Add 18 type predicates: keyword?, symbol?, string?, number?, integer?,
  float?, vector?, map?, set?, list?, seq?, coll?, sequential?, fn?,
  boolean?, true?, false?, some?
- Add collection fns: second, ffirst, nfirst, peek, pop
- Add keyword/symbol ops: keyword, symbol, name, namespace, key, val
- Update eval interpreter = to handle structural collection equality
- Add test_single.py + test_vals.clj for Clojure test suite runner
- Add docs/en/07 and docs/bg/07 for cross-dialect test suite compatibility
- Update README with test suite documentation link

test_vals.clj

@@ -0,0 +1,6 @@
+(do
+  (defmacro is [form]
+    `(let [result# ~form]
+       (if result# nil (println "FAIL:" (quote ~form)))))
+  (println [1 2 (is true) 3])
+)