Merge branch 'dev' into 'master'

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

See merge request bohacfr2/apo-sem!1

feat: allow horizontal scroll in initial window

feat: make copy-executable copy another needed files to mz_apo

refactor: remove todos

feat: add dialog for contextmenus on folders

feat: add files contextmenu

feat: add text viewer better keyboard controls

fix: add correct error if file cannot be executed

refactor: split local file access

refactor: minimize filebrowser main functions

fix: incorrect table item offset

refactor: split filebrowser main to more functions

feat: add controls text file open

refactor: split browser window

feat: add pheripherals usage to file browser

fix: execute program without argument

feat: add better navigation

fix: avoid uninitialized values when stat fails

fix: macro long types

feat: executing file add pipe for stderr