Enhancement
Currently, tl:ThemeVar are declared in various places such as in renderers or in the tl:JFreeChartComponent.
Instead, the tl:ThemeVar should be consistently declared in the tl:Icons classes.
Improvement
The static initializer {{#!java static {
initConstants(Icons.class);
} }}} is no longer needed for the constants in the tl:Icons classes.
Code migration
By "moving" theme variables into icons classes, the corresponding variables must be qualified in the theme-settings.xml, for example.
Test
No test. Refactoring.