Add Json importer (#46)

add boost-json to dependencies

tools/doc/extra/overview.hpp

@@ -17,7 +17,7 @@ The MSE source code is subdivided into several directories, with the following m
  - <tt>gfx</tt>:  Graphics related functions, again mostly independent of MSE.
                   This directory contains algorithms for image blending, scaling, and bezier curve functions.
  - <tt>data</tt>: Data structures, like sets, cards, symbols, etc.
-                  These data structures are documented in the <a href="http://magicseteditor.sourceforge.net/extending">'Extending MSE'</a> section of the official documentation.
+                  These data structures are documented in the <a href="https://mseverse.miraheze.org/wiki/Dev:Data_types">'Data types'</a> section of the documentation.
      - <tt>data/action</tt>: Actions that can be applied to those data structures.
      - <tt>data/field</tt>:  Data types for fields, values and styles. One source file per type.
      - <tt>data/format</tt>: File formats and import/export stuff.
@@ -39,4 +39,4 @@ Additional tools (not needed for building MSE) also depend on:
  - <a href="http://doxygen.org">doxygen</a> for generating the documentation.
  - Perl for small utility scripts
 
-*/
+*/

tools/website/updates

@@ -10,4 +10,4 @@ description:
 	<li>Added a "Console" panel for error messages and code evaluation.
 	<li>Fixed several bugs
 	</ul>
-	<a href="http://magicseteditor.sourceforge.net/download">Get version 2.0.0 from the MSE download page</a>.
+	<a href="https://magicseteditor.boards.net/page/downloads">Get version 2.5.8 from the MSE download page</a>.