Merge branch 'dev' into 'master'

Implement first versions of file browser, text viewer and image viewer

See merge request bohacfr2/apo-sem!1

refactor: split local file access

fix: avoid uninitialized values when stat fails

feat: add files sort

fix: path stuck

feat: add file executing

feat: add get file local path so it can be executed

feat: implement basic directory browser window

refactor: make fileaccess state from union

refactor: do not use dynamic allocation where not needed

feat: add directory list

feat: add local file access functions