* 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
With the approaching games, PKM sprites are a different size from the 3DS era (as already hinted by LGPE, which has 56x68). It'll be a little easier to manage with this portion of the library walled off from the rest of the codebase.
Eventually the net46 target will use fody or something to merge in these extra dependency dll's automatically to not disturb the usual exe/dll experience.
Rewrote showdown set exporting to be much clearer, added auto-fixing of
relearn moves when importing showdown set (applies suggested relearn
moves)
Simplified main form loading routine (from ~160 to ~25 by extracting
methods)
Closes#1236
pk4/bk4 only, obviously
side note, using static events is no-no, designer auto-removed them.
just manually reapply (as well to others that used it)
