[Ohrrpgce] SVN: teeemcee/9480 For safety, wait for the user to release all keys before spawning a grap

[subversion at HamsterRepublic.com]

teeemcee
2017-09-26 07:37:12 -0700 (Tue, 26 Sep 2017)
256
For safety, wait for the user to release all keys before spawning a graphical program

This is done in all cases on all OSes, but it's mainly targetted at
Windows with gfx_sdl, where it really does fix stuck keys. I'm not aware
of it fixing other problems.
---
U   wip/allmodex.bas
U   wip/allmodex.bi
U   wip/common.rbas
U   wip/customsubs.rbas
U   wip/os_unix.c