face down card cannot activate effect generally
硫酸のたまった落とし穴  is not special now

* new trap monster rule

* new ruling of special summon once

* new ruling of (special) summon count in oath

* new ruling of trigger effect

trigger effect cannot be activated if the card is moved to other place

* update (extra) deck effect handling

including new rule that effect of face down card in extra deck cannot be activated unless explicitly written

* new trap monster rule: changing to face down

* new trap monster rule: disabled

* fix changing to face down of trap monster

close #293

if the target is self destroyed, it should not count in the return value

except in field::process

round decimals correctly in scripts
close #264

conditionally-explicit constructor of std::tuple is a c++17 library feature

should not activate in EVENT_SUMMON/EVENT_FLIP_SUMMON/EVENT_SPSUMMON

see Fluorohydride/ygopro-scripts@a2e1b60b29076c0f938f4af2a80cc0171e3644f6

close Fluorohydride/ygopro#2238

see 90a07a09

triggered by event raised during adding chains should activate after chain end

fix #215

see Fluorohydride/ygopro-scripts@1b7ef0d

close Fluorohydride/ygopro-core#270