[Ohrrpgce] SVN: teeemcee/8418 Add "Initial music/sound effects volume" settings, and change default sf

[subversion at HamsterRepublic.com]

teeemcee
2017-02-19 06:40:04 -0800 (Sun, 19 Feb 2017)
822
Add "Initial music/sound effects volume" settings, and change default sfx volume to 75% from 100%

So default music/sfx volumes change from 50%/100% to 50%/75%. I
did this to bring them closer together, since the sfx are too loud
in most OHR games. But I didn't want to change them too much, since
some games (especialy well polished ones) immediately set the music
volume to 100% to match the sfx volume, or have manually reduced
sfx volumes.
According to scanscripts.py, 37 games use setmusicvolume,
of which just 8 do setmusicvolume(255).
It's not a big problem, since the player will be able to adjust
volumes anyway.

Added a fixbit fixInitDefaultVolumes to set the initial volumes.

Also, in new games the default music/sfx volumes are 75%/75%.

The ingame-defaults are also used when previewing music/sfx in custom.
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U   wip/browse.bas
U   wip/common.rbas
U   wip/const.bi
U   wip/custom.bas
U   wip/docs/plotdict.xml
U   wip/game.bas
U   wip/ohrrpgce.new
U   wip/subs4.bas
U   wip/whatsnew.txt
U   wip/yetmore2.bas