Suggested default settings

Making a merge request for suggested new default settings, because saying "hey, I think this would be a better default, you guys should try it" in IRC won't actually get people to give you opinions on them ;p

Camera distance is 160 now, height is 25, and speed is 0.3 (previously 128, 20, 0.25, respectively). Mouse sensitivity on both axes is now 12, previously 35. The default move/look/jump/spin keys is Mystic's proposed scheme from the New Player Experiences topic (https://mb.srb2.org/showthread.php?t=42095).

Camera settings also now can save to your config.cfg, and they won't try resetting back to the default at every chance it gets. (~~As a side effect, analog mode won't have higher cam_dist anymore. Poor analog mode, no one cries for you.~~ Now increases cam_dist in analog mode by x1.2!) This makes it so everything that's different can be easily reverted back to the older setting.

Test exe in my folder, <root>/TehRealSalt/srb2win_changed-defaults.exe

See merge request !75