[kuroneko] improved TextBox method
[kuroneko] improved TextBox method

re: [0] vs {0}
In SPIN accessing value[0] is the same as value, the latter is smaller
and faster. To keep the idea of an array access we use comment brackets
which look like an array access but don't cause the overhead.

konimaru/lamestation-sdk,konimaru/lamestation-sdk,lamestation/lamestation-sdk,lamestation/lamestation-sdk