Fix syntax highlighting unicode support (#475)

* convert BasicParser to a template

* fix syntax hightlighting with unicode characters

src/coders/toml.cpp

@@ -9,11 +9,11 @@
 #include "data/setting.hpp"
 #include "io/settings_io.hpp"
 #include "util/stringutil.hpp"
-#include "commons.hpp"
+#include "BasicParser.hpp"
 
 using namespace toml;
 
-class TomlReader : BasicParser {
+class TomlReader : BasicParser<char> {
     dv::value root;
 
     void skipWhitespace() override {