feat: add extern device access

refactor: make fileaccess state from union

feat: add temp file access

feat: add copy and move operations for local filesystem

refactor: do not use dynamic allocation where not needed

feat: add directory list

fix: some file access function types

feat: add file execute process

feat: add local file access functions

fix: add include guards to path

refactor: fix inconsistency in file access function definitions

feat: add structure for dynamic file access