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Merge pull request #33 from npisanti/master

adds step port to L

--- a/sim.c

+++ b/sim.c

@@ -556,7 +556,9 @@

 BEGIN_OPERATOR(loop)

   LOWERCASE_REQUIRES_BANG;

+  PORT(0, -2, IN | PARAM);

   PORT(0, -1, IN | PARAM);

+  Usz rate = index_of(PEEK(0, -2));

   Usz len = safe_index_of(PEEK(0, -1));

   if (len > width - x - 1)

     len = width - x - 1;

@@ -566,13 +568,13 @@

   }

   if (len == 0)

     return;

+  rate = rate % len;

   Glyph buff[Glyphs_index_count];

   Glyph* gs = gbuffer + y * width + x + 1;

-  Glyph hopped = *gs;

   for (Usz i = 0; i < len; ++i) {

-    buff[i] = gs[i + 1];

+    Usz offset = (i + rate) % len;

+    buff[i] = gs[offset];

   }

-  buff[len - 1] = hopped;

   for (Usz i = 0; i < len; ++i) {

     gs[i] = buff[i];

   }