enhancement
Currently, tl:ThemeVar is declared in a wide variety of places, such as in renderers or in the tl:JFreeChartComponent.
Instead, the tl:ThemeVar variables 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
Due to the "movement" of theme variables into Icons classes, the corresponding variables must be qualified, for example, in theme-settings.xml.
Test
No test. Refactoring.