Fixed invalid component name error (#432)

Author: Antonio Salinas

internal/app/azldev/core/sources/sourceprep.go

@@ -238,7 +238,7 @@ func (p *sourcePreparerImpl) postProcessSources(
 func synthesizeMacroLoadOverlays(macrosFileName string) ([]projectconfig.ComponentOverlay, error) {
 	// Basic check that the macros file name is valid and doesn't require escaping.
 	if strings.ContainsFunc(macrosFileName, func(r rune) bool {
-		return !unicode.IsLetter(r) && !unicode.IsDigit(r) && r != '.' && r != '-' && r != '_'
+		return !unicode.IsLetter(r) && !unicode.IsDigit(r) && r != '.' && r != '-' && r != '_' && r != '+'
 	}) {
 		return nil, fmt.Errorf(
 			"macros file name %#q contains invalid characters; does the component name contain invalid characters?",