* Remove unused imports
Start FileSystem UI
Fix formating
Add textures for dir and file, implement prepare_ui, render, update and open directory
Display choose file
Display files and directories
Format code
Expand and collapse directories, open file
Format code
Fix calculating size of directory and displaying children
Refactor render open file modal
Format code
Scroll file tree
Format code
Refactor open file modal
Fix CI
Fix some tests, add more tests, fix formatting
Fix CI test run
Fix CI test run
* Add more tests
* Add more tests
* More tests
* More tests
* Fix caret position
* Add simple string matching
* Fixing add characters
* Fix themes images
* Simplify
* Simplify
* Simplify
* Fix some problems
* Fix race conditions in tests
* Format code
* Format code
* Add circleci and codecov
* Update version
* Fix format test
* Fix CI
* Add tarpaulin
* Format code
* Fix tarpaulin
* lexers tests
* Remove non-lexer token type, add more tests
* More tests
* More tests
* Refactor, some test, split code, add more traits
* Add codecov config
* Fix code style
* Test text character
* Menu bar tests
* Caret tests
* Refactor caret, more caret tests
