[Ohrrpgce] SVN: teeemcee/11898 Fix ensure_normal_palette/restore_previous_palette for new screen fading

[subversion at HamsterRepublic.com]

teeemcee
2020-07-18 00:43:31 -0700 (Sat, 18 Jul 2020)
259
Fix ensure_normal_palette/restore_previous_palette for new screen fading.

Plus, calls to them can now be nested, and they restore the faded state to the
colour it was before, not black.

Also, added setpal_to_color and pass fadems through fadein and fadeout.
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U   wip/allmodex.bas
U   wip/allmodex.bi
U   wip/browse.bas
U   wip/common.bi
U   wip/common.rbas