move seqan3::views::rank_to to seqan3/alphabet/views/

[marehr]

Tasks

• [x] move seqan3::views::rank_to to seqan3/alphabet/views/
• [x] old header rank_to.hpp should be deprecated as we did with the utility move (see https://github.com/seqan/seqan3/commit/dc7862cd0010ae80d2faf001c47bcbdc944a3807)

From 6e2eaf18064a48d91b9415d9eb847cb00f282100 Mon Sep 17 00:00:00 2001
From: marehr <marehr-github@marehr.dialup.fu-berlin.de>
Date: Sun, 18 Apr 2021 12:47:49 +0200
Subject: [PATCH 15/35] TODO: [MISC] move seqan3::views::rank_to to
 seqan3/alphabet/views/

---
 include/seqan3/range/views/rank_to.hpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/seqan3/range/views/rank_to.hpp b/include/seqan3/range/views/rank_to.hpp
index 815d17329..3b09082ee 100644
--- a/include/seqan3/range/views/rank_to.hpp
+++ b/include/seqan3/range/views/rank_to.hpp
@@ -62,6 +62,9 @@ namespace seqan3::views
  * ###Example
  * \include test/snippet/range/views/rank_to.cpp
  * \hideinitializer
+ *
+ * \stableapi{Since version 3.1.}
+ * TODO move to seqan3/include/alphabet/views/rank_to.hpp
  */
 template <typename alphabet_type>
 //!\cond
-- 
2.31.1