obey `end_of_line` setting in all tokens (#550)

Multi-line tokens would be written with `LF`, regardless the `end_of_line` setting.

Fixes #228 and also produces end_of_line specified line-endings in strings.

.gitattributes

@@ -0,0 +1,4 @@
+tests/issue0228.d               text eol=lf
+tests/allman/issue0228.d.ref    text eol=crlf
+tests/knr/issue0228.d.ref       text eol=crlf
+tests/otbs/issue0228.d.ref      text eol=crlf

src/dfmt/formatter.d

@@ -1825,6 +1825,8 @@ private:
     {
         import std.range:retro;
         import std.algorithm.searching:countUntil;
+        import std.algorithm.iteration:joiner;
+        import std.string:lineSplitter;
 
         if (current.text is null)
         {
@@ -1834,12 +1836,7 @@ private:
         }
         else
         {
-            // You know what's awesome? Windows can't handle its own line
-            // endings correctly.
-            version (Windows)
-                output.put(current.text.replace("\r", ""));
-            else
-                output.put(current.text);
+            output.put(current.text.lineSplitter.joiner(eolString));
             switch (current.type)
             {
             case tok!"stringLiteral":

tests/allman/issue0228.d.ref

@@ -0,0 +1,8 @@
+/* This test relies on ../.gitattributes to contain these lines:
+
+tests/issue0228.d               text eol=lf
+tests/allman/issue0228.d.ref    text eol=crlf
+tests/knr/issue0228.d.ref       text eol=crlf
+tests/otbs/issue0228.d.ref      text eol=crlf
+
+*/

tests/issue0228.args

@@ -0,0 +1 @@
+--end_of_line=crlf

tests/issue0228.d

@@ -0,0 +1,8 @@
+/* This test relies on ../.gitattributes to contain these lines:
+
+tests/issue0228.d               text eol=lf
+tests/allman/issue0228.d.ref    text eol=crlf
+tests/knr/issue0228.d.ref       text eol=crlf
+tests/otbs/issue0228.d.ref      text eol=crlf
+
+*/

tests/knr/issue0228.d.ref

@@ -0,0 +1,8 @@
+/* This test relies on ../.gitattributes to contain these lines:
+
+tests/issue0228.d               text eol=lf
+tests/allman/issue0228.d.ref    text eol=crlf
+tests/knr/issue0228.d.ref       text eol=crlf
+tests/otbs/issue0228.d.ref      text eol=crlf
+
+*/

tests/otbs/issue0228.d.ref

@@ -0,0 +1,8 @@
+/* This test relies on ../.gitattributes to contain these lines:
+
+tests/issue0228.d               text eol=lf
+tests/allman/issue0228.d.ref    text eol=crlf
+tests/knr/issue0228.d.ref       text eol=crlf
+tests/otbs/issue0228.d.ref      text eol=crlf
+
+*/