Introduced new tft interface and added iconconverter

icon_templ.cpp.tmpl

@@ -0,0 +1,9 @@
+#include "${name}.h"
+
+namespace espgui {
+namespace icons {
+const Icon<${width}, ${height}> ${name} {{
+${bytes}
+}};
+} // namespace icons
+} // namespace espgui