[Tolk] Completely rework stdlib: multiple files and renaming

- split stdlib.tolk into multiple files (tolk-stdlib/ folder)
  (the "core" common.tolk is auto-imported, the rest are
  needed to be explicitly imported like "@stdlib/tvm-dicts.tolk")
- all functions were renamed to long and clear names
- new naming is camelCase

tolk-tester/tests/imports/use-dicts-err.tolk

@@ -0,0 +1,21 @@
+fun prepareDict_3_30_4_40_5_x(valueAt5: int): cell {
+    var dict: cell = createEmptyDict();
+    dict~idict_set_builder(32, 3, begin_cell().store_int(30, 32));
+    dict~idict_set_builder(32, 4, begin_cell().store_int(40, 32));
+    dict~idict_set_builder(32, 5, begin_cell().store_int(valueAt5, 32));
+    return dict;
+}
+
+fun lookupIdxByValue(idict32: cell, value: int): int {
+    var cur_key = -1;
+    do {
+        var (cur_key redef, cs: slice, found: int) = idict32.idict_get_next?(32, cur_key);
+        // one-line condition (via &) doesn't work, since right side is calculated immediately
+        if (found) {
+            if (cs~load_int(32) == value) {
+                return cur_key;
+            }
+        }
+    } while (found);
+    return -1;
+}

tolk-tester/tests/imports/use-dicts.tolk

@@ -0,0 +1,23 @@
+import "@stdlib/tvm-dicts"
+
+fun prepareDict_3_30_4_40_5_x(valueAt5: int): cell {
+    var dict: cell = createEmptyDict();
+    dict~iDictSetBuilder(32, 3, beginCell().storeInt(30, 32));
+    dict~iDictSetBuilder(32, 4, beginCell().storeInt(40, 32));
+    dict~iDictSetBuilder(32, 5, beginCell().storeInt(valueAt5, 32));
+    return dict;
+}
+
+fun lookupIdxByValue(idict32: cell, value: int): int {
+    var cur_key = -1;
+    do {
+        var (cur_key redef, cs: slice, found: int) = idict32.iDictGetNext(32, cur_key);
+        // one-line condition (via &) doesn't work, since right side is calculated immediately
+        if (found) {
+            if (cs~loadInt(32) == value) {
+                return cur_key;
+            }
+        }
+    } while (found);
+    return -1;
+}