Launcher GUI and remember recently randomized files

[Die4Ever]

could turn this into a launcher, have a list of randomized games to start by running the eduke32.exe with the right arguments, could choose one and randomize a new seed for it, maybe a button for quick rerandomize using the same settings but a new seed

[Die4Ever]

output bat file for Duke3d, Ion Fury, Shadow Warrior, and Blood 1f20037

improvements to cleanup and notifying the user of the bat file 8c41b11

warn user when bat file unable to be created dbaee6a