func-*.go modules renamed as builtin-*.go.

Also changed and exported some identiefier relatet to the builtin feature

global-context.go

@@ -12,8 +12,8 @@ import (
 var globalCtx *SimpleStore
 
 func ImportInContext(name string) (exists bool) {
-	var mod *module
-	if mod, exists = moduleRegister[name]; exists {
+	var mod *builtinModule
+	if mod, exists = builtinModuleRegister[name]; exists {
 		mod.importFunc(globalCtx)
 		mod.imported = true
 	}
@@ -22,7 +22,7 @@ func ImportInContext(name string) (exists bool) {
 
 func ImportInContextByGlobPattern(pattern string) (count int, err error) {
 	var matched bool
-	for name, mod := range moduleRegister {
+	for name, mod := range builtinModuleRegister {
 		if matched, err = filepath.Match(pattern, name); err == nil {
 			if matched {
 				count++