Closes#3400
Lots of controls are slow to render; datagrid is fine. Wire it up so that it detects & updates the custom research checkbox on the other tab.
* Move pkhex.drawing calls out of form constructors
designer doesn't like it; if Main can't be designed then there's some
call that it can't process for whatever reason
* Add netcore3 targeting
Closes#2198 by adding a netcore3 build option
Closes#2391 by retaining designer functionality and net46 builds
Closes#1895 , re-verified with pkm provided in #1805
there's no shedinja gift, always is an evolution
seal some forms to remove virt call in constructor warning
