[Ohrrpgce] SVN: teeemcee/10511 Add serrMajor script error level & improve the "interpreter overloaded"

[subversion at HamsterRepublic.com]

teeemcee
2018-08-21 07:03:40 -0700 (Tue, 21 Aug 2018)
301
Add serrMajor script error level & improve the "interpreter overloaded" error message

The message is now "too many scripts running" instead of "interpreter
overloaded", and no longer says "Game data may be support or
unsupported". serrMajor is for serious errors which don't indicate data
corruption.
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U   wip/common.rbas
U   wip/const.bi
U   wip/scriptcommands.bas
U   wip/scripting.bas