G-o-T-o
G-o-T-o
Option 'build_flags = -w' in platformio.ini file resolves the issue, but nevertheless the errors should be fixed at the source.
NOTE: a) the fist two commits deal with no-return-value errors regarding Sprite.cpp file and they should be resolved by the second commit (as suggested by @filipbudisa in the previous comment)....
For `ElementContainer& ScrollLayout::addChild(Element*)` I returned also `*this` as `ScrollLayout` class is derived from `ElementContainer` class.