Fix Learnings/Reports from Alphatesters

Packages

[x] Sortorder of Packages would be nice by "last played"
[x] Package Filter in Package View (Testers already have 20+ real Packages)
[x] When a List is selected in the WAD or Package View its confusing because the actual Packagename is not shown / Reset Mechanic is also confusing
[x] Option to set a "default" Config for Packages, the default GZDOOM Config sucks bad / too much to config everytime a new Package is made
[x] Option for "Load Last Savegame" (When -savedir is given) direct in the Launcher would be a nice Feature
[x] No Toast when saved/edited a Package

[x] Placeholders for -savedir and -config are confusing, people didnt see that it was a placeholder
[x] Term of "Use Config/Save Parameter" is confusing for people

[x] Screenshot parameter/Directory in Sourceports is not needed, noone will config that
[x] "Save Directory" name for the Input in Settings is confusing
[x] Problems with configfiles with other Sourceports than GZDOOM (always called gzdoom.ini)