blockparser: Add missing includes to fix msvc builds

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

include/maddy/blockparser.h

@@ -9,6 +9,9 @@
 #include <functional>
 #include <sstream>
 #include <string>
+// windows compatibility includes
+#include <cctype>
+#include <algorithm>
 
 // -----------------------------------------------------------------------------