* 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
Adds game selection subform for RSEFRLG/Memcard game selection
Backs up entire memory card instead of just gci when loading from
memcard
Reduce string usage (easier dialog translation if that ever happens)
Does the memory card store date last saved? Could be used to autodetect
the last saved game and load directly instead of selecting.