make SFX::hold return reference *this
trying to adjust warning_strip and stage outline effect to better accomodate death countdown
fix get_chain effect and adjust dying effect
make Dying to call attach_chain, it's more appropriate here than the 'start of dying'
A dummy function for adjustment in OneFading
make go_dying after chain tagged and fading, it makes more sense when it comes to visual events
tempo adjustment
make SFX::hold return reference
added a flag to easier determine which column is full when doing visuals
split chain tagging into 2 phase, the first phase is here to seek out other simultaneous OneFadings happening in the same frame which should be grouped, the other phase is at Dying, only when Dying finished can you really attach chains
various adjustment due to changes from OneFading