JSON refactoring (hopefully fix compile error)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28664 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
rename HttpRequest -> HttpRequestD/W

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28665 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
remove exponent processing for LaTeX ² -> ^2 etc

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@28666 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e