* 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
kinda have to restrict these to 'valid' choices; should be enough of a
selection->result to be adequate for changing version
restart the program after changing the setting; won't take effect until
rebooted.
#1864
need to hook into main window & delete old logic; when the logic flow
returns after closing the form, all the propagated settings will need to
be copied (ie where the setting is actually used).
translateinterface will translate the control text to a longform
descriptor per the current language.
