* Refactor object creation logic.
Remove unused LVGL features.
* Remove unused files.
Fix height for widgets.
* Rename 'OpenTxTheme' class to 'EdgeTxTheme'.
Cleanup commented out code.
Cleanup unused code from 'etx_lv_theme.cpp'.
* More cleanup.
* Move more style code to etx_lv_theme.cpp
* Update license
* Make default button height match other controls.
* Fix curve edit layout.
* Fix layouts.
* FormWindow and FormGroup provided identical functionality - rename FormGroup to FormWindow and remove duplicate.
* Simplify menu icon handling.
Remove unused 'flysky.cpp' file.
* Fix window size change.
* Simplify page header code.
Fix statistics view page.
* Remove unused file.
Replace redundant 'Subtitle' class with a macro.
Fix compiler warnings.
* Fix compiler warning in LvglWrapper.cpp.
Remove unused code in static.h.
Simplify about page.
* Rename ICON_OPENTX to ICON_EDGETX.
* Fix github build error.
* Fix github build error (attempt 2).
* Move ButtonMatrix styling to etx_lv_theme.cpp.
* Scroll bar consistency.
* Use styles for ButtonMatrix text color.
* Use 'active' color for selected USB advanced setup buttons. Move error message to bottom of page.
* Create style for popup window title bar.
Simplify advanced USB setup code.
Remove unused libopenui/carousel.* files.
* Add style for modal popup content.
* Remove unused BUTTON_BACKGROUND flag.
* Replace GridLayout with FormWindow. Remove unused gridlayout.h file.
* Fix rebase.
* Merge ChoiceEx class into Choice class code.
Remove unused CurveKeyboard.
* Use LVGL bar for progress indicator.
Update only style colors when theme changes (don't recreate all style settings).
* Move ProgressDialog class to dlalog.h/dialog.cpp files.
* Simplify trim and slider code in main view.
Simplify the hardware inputs code.
Fix dialog size.
Remove unused code in layout factory.
* Cleanup unused code.
* Add style for FormWindow class.
Merge BaseNumberEdit class into NumberEdit class and remove BaseNumberEdit.
Remove more unused files.
Cleanup libopenui_config.h files.
* Re-organise libopenui include files to fix build error.
* Fix build error.
* Add missed styles to etx_lv_theme.cpp.
Delete commented out #includes.
More cleaning up of libopenui_xxx.h files and dependencies.
Re-enable LVGL CHECKBOX feature.
* Merge libopenui_helpers.h into opentx_helpers.h file.
* Fix firmware build.
* Use object constructors for LVGL object creation as suggested by gagarinlg.
Add style for number edit text alignment.
Fix background color for focussed control.
* Move color related stuff from libopenui_defines.h to colors.h.
Remove need for libopenui_depends.h file.
* Merge libopenui_types.h content into opentx_types.h file.
* Rename CheckBox class to ToggleSwitch.
* Restore code to update flight mode text color when theme changes.
* Cleanup some more unused code.
* Remove redundant theme.h file.
* Fix rebase.
* Fix button matrix style.
* Fix rebase
* Fix rebase
* Ensure correct initialisation of Choice object.
* Fix rebase.
* Make the slider control bigger to make touch activation easier.
* Fix build error.
* Fix slider logic and cleanup code.
* Use ACTIVE theme color for inputs, mixes, LS, GV and SF.
* Improved border width consistency and focussed state consistency.
* Remove duplicate copy of the default theme colors.
* fix: use keysGetMaxTrims() instead of MAX_TRIMS
* feat: add support for virtual trims
This is necessary for radios like X-lite where half of the trims are simulated
