Add function isRendered() to guiElement.base. Fix bug with colors fields on api pages.
Add function isRendered() to guiElement.base.
Fix bug with colors fields on api pages.

vst/vst-utils#109
polemarch/ce#174

[ci skip]

vstconsulting/polemarch,vstconsulting/polemarch,vstconsulting/polemarch,vstconsulting/polemarch