Study a different way to use tokens in code

[paulinea]

Test Google solution to use tokens values directly by using OudsTheme object values to be able to replace for example OudsColorKeyToken.Content.Default.value by OudsTheme.colorScheme.content.default

If the study is conclusive, we should document OudsBorders, OudsColorScheme, OudsElevations, OudsGrids, ... and remove @Suppress annotations.
Nested classes can be created in these data classes if necessary.
fromToken() and .value will be used internally only.