[Ohrrpgce] SVN: teeemcee/10727 Add debugerror, showbug, fatalbug functions and rearrange ErrorLevelEnum

[subversion at HamsterRepublic.com]

teeemcee
2018-09-30 04:39:04 -0700 (Sun, 30 Sep 2018)
543
Add debugerror, showbug, fatalbug functions and rearrange ErrorLevelEnum levels

There are now aliases for most debugc error levels:
 debuginfo
 debug
 visible_debug
 debugerror
 showerror
 showbug
 fatalerror
 fatalbug
So I will mostly stop using debugc.

Got rid of errShowError, renamed errShow to errShowError and errFatal to
errFatalError, added errShowInfo and errShowDebug (the latter is
visible_debug). Simplified visible_debug and dist_info.

Also, forgot to update errorlevel.h and C/C++ code after renaming ErrorLevelEnum
constants.
---
U   wip/allmodex.bas
U   wip/array.c
U   wip/common.rbas
U   wip/common_base.bas
U   wip/common_base.bi
U   wip/const.bi
U   wip/distribmenu.bas
U   wip/errorlevel.h
U   wip/filelayer.cpp
U   wip/gfx_sdl2.bas
U   wip/misc.h
U   wip/surface.cpp