[Ohrrpgce] SVN: james/10172 Add a general bitset to hide empty save slots at the bottom of the save/

[subversion at HamsterRepublic.com]

james
2018-03-21 15:42:57 -0700 (Wed, 21 Mar 2018)
194
Add a general bitset to hide empty save slots at the bottom of the save/load menu

Shows one empty slot at the bottom in save mode.
Won't show less than 4 slots unless you set a max lower than 4
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U   wip/common_menus.bas
U   wip/menustuf.rbas
U   wip/whatsnew.txt