make fullpaths the default in error messages and stack traces for mor… (#11385)

* make fullpaths the default in error messages and stack traces for more convenient development
* split up -d:release into -d:release and -d:danger flags
* workaround a Nim config parser bug
* fixes an old nim config parser bug
* make megatest green again
* make nimpretty tests work again
* make nimsuggest green

compiler/options.nim

@@ -276,7 +276,8 @@ const
     optBoundsCheck, optOverflowCheck, optAssert, optWarns,
     optHints, optStackTrace, optLineTrace,
     optTrMacros, optNilCheck, optMoveCheck}
-  DefaultGlobalOptions* = {optThreadAnalysis}
+  DefaultGlobalOptions* = {optThreadAnalysis,
+    optExcessiveStackTrace, optListFullPaths}
 
 proc getSrcTimestamp(): DateTime =
   try:
@@ -312,7 +313,7 @@ proc newConfigRef*(): ConfigRef =
     macrosToExpand: newStringTable(modeStyleInsensitive),
     m: initMsgConfig(),
     evalExpr: "",
-    cppDefines: initSet[string](),
+    cppDefines: initHashSet[string](),
     headerFile: "", features: {}, foreignPackageNotes: {hintProcessing, warnUnknownMagic,
     hintQuitCalled, hintExecuting},
     notes: NotesVerbosity[1], mainPackageNotes: NotesVerbosity[1],
@@ -540,7 +541,7 @@ proc getNimcacheDir*(conf: ConfigRef): AbsoluteDir =
              conf.projectPath / genSubDir
            else:
             AbsoluteDir(getOsCacheDir() / splitFile(conf.projectName).name &
-               (if isDefined(conf, "release"): "_r" else: "_d"))
+               (if isDefined(conf, "release") or isDefined(conf, "danger"): "_r" else: "_d"))
 
 proc pathSubs*(conf: ConfigRef; p, config: string): string =
   let home = removeTrailingDirSep(os.getHomeDir())