* 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
Grab an example PKM (from main window) to get the current value to
assist users in creating their modification scripts.
Added 3 tooltips for hovering over property/type/value controls
