+fix: source file resolving if debugee is located in subdir

[mlauke]

+fix: error message handling
+feat: add steckschwein to list of emulators supporting cc65-dbg

[mlauke]

mhm... little bit tricky. will do some regression tests for windows... and with a .dbg file with absolute file names.

[mlauke]

@smokku hi, needed to change the source lookup a little bit, but now it works for various workspace setups. e.g. workspaces with sub directories. furthermore i've added an srcDirs configuration option to allow for configuration of additional paths to lookup source files. useful for cc65 module libraries. e.g. had to deal with .dbg files like

version	major=2,minor=0
info	csym=0,file=29,lib=1,line=2863,mod=9,scope=16,seg=7,span=1456,sym=2026,type=9
file	id=0,name="games/shmup/shmup.s",size=16686,mtime=0x69AC1294,mod=0
...
file	id=7,name="steckos/asminc/common.inc",size=7523,mtime=0x69A1795B,mod=0+0
file	id=20,name="../../steckos/asminc/zeropage.inc",size=2124,mtime=0x69A1795B,mod=8
file	id=21,name="../../steckos/asminc/vdp.inc",size=12927,mtime=0x69A1795B,mod=3+4+5+6+7
file	id=22,name="../../steckos/asminc/system.inc",size=2499,mtime=0x69A1795B,mod=3+4+5+6+7
...
file	id=23,name="t99xx/mode2.s",size=3118,mtime=0x69A1795B,mod=3
file	id=24,name="t99xx/t99x_memcpy.s",size=2349,mtime=0x69A1795B,mod=4
...
lib	id=0,name="steckos/lib/steckschwein.a"

where source paths of modules within a library also use relative paths which may not reside in the current workspace or different directory from the program which is debugged.

[smokku]

LGTM

[smokku]

@mlauke Thank you for your contribution. 😺

[mlauke]

@smokku forgot to increase version number in package.json etc... or will you do it before shipping it to https://marketplace.visualstudio.com/items?itemName=X65-Project.cc65-dbg ?

[smokku]

or will you do it before shipping it marketplace.visualstudio.com

Bumping the version is the part of release procedure.