[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

crypto/smartcont/tolk-stdlib/lisp-lists.tolk

@@ -0,0 +1,38 @@
+// A part of standard library for Tolk
+tolk 0.6
+
+/**
+    Lisp-style lists are nested 2-elements tuples: `(1, (2, (3, null)))` represents list `[1, 2, 3]`.
+    Elements of a list can be of different types.
+    Empty list is conventionally represented as TVM `null` value.
+ */
+
+@pure
+fun createEmptyList(): tuple
+    asm "PUSHNULL";
+
+/// Adds an element to the beginning of lisp-style list.
+/// Note, that it does not mutate the list: instead, it returns a new one (it's a lisp pattern).
+@pure
+fun listPrepend<X>(head: X, tail: tuple): tuple
+    asm "CONS";
+
+/// Extracts the head and the tail of lisp-style list.
+@pure
+fun listSplit<X>(list: tuple): (X, tuple)
+    asm "UNCONS";
+
+/// Extracts the tail and the head of lisp-style list.
+@pure
+fun ~listNext<X>(list: tuple): (tuple, X)
+    asm( -> 1 0) "UNCONS";
+
+/// Returns the head of lisp-style list.
+@pure
+fun listGetHead<X>(list: tuple): X
+    asm "CAR";
+
+/// Returns the tail of lisp-style list.
+@pure
+fun listGetTail(list: tuple): tuple
+    asm "CDR";