replace usage of char* and apropriate XtFree() by OksXm::AutoCstring in several places of OKS data editor; fix several 0 vs. NULL problems in XtVa(...) functions
Security Notice: GitLab has uncovered a widespread malicious npm supply-chain attack that potentially can destroy user data. All teams are required to audit packages. Further information can be found under the Computer Security Report for November 2025 and the original blog post in https://about.gitlab.com/blog/gitlab-discovers-widespread-npm-supply-chain-attack/
replace usage of char* and apropriate XtFree() by OksXm::AutoCstring in several places of OKS data editor; fix several 0 vs. NULL problems in XtVa(...) functions