[EGD-5088] Change new filesystem implementation

Removed deprecated vfs calls from all applications.

[EGD-4828] Add GUI tests for DOM flow

 * `DepthFirstItemTree` tests - basic traverse functionalities
 * `GuiVisitor` tests - basic double dispatch calls
 * DOM serializer tests - basic serialization functionalities

[EGD-4780] Change in GUI documentation to cover DOM

 * GUI Visitor documentation added
 * GUI DOM documentation added

[EGD-5010] Fix Text tests leaks

Fixed leaks in gui Text tests.

[EGD-4925] Change new filesystem handling implementation in module-gui. (#1193)

Due to vfs deprecation there is need to remove all vfs calls from code. This PR covers module gui. There are some modifications in other modules included which are necessary because of build system issues.

[EGD-3442] Fix list empty window unhandled behaviours, in place rebuild handling, notes rebuild on note deletion and changed call Icon name to stateIcon. (#1160)

Merge branch 'master' into stable

[EGD-3589] gui - DOM dump functionality for gui::Item  (#1148)

[EGD-4687] Text enum names cleanup. (#1142)

Change enum names to CamelCase.

Merge branch 'master' into stable

[EGD-3499] Text scrolling added and its usage updated in widgets. (#1079)

Add Text scrolling, Add text starting position,

Added text scrolling, updated TextLine line endings, TextBlocks newline handling, updated SMS Bubble and Notes text items. Added tests for scrolling.

[EGD-4150] Change filename i18 to i18n (#1108)

Change filename of internationalization files from i18 to i18n.

I18n should stand for internationalization, not i18. That's why I changed in 'module-utils' name of the folder 'i18' and both .cpp and .hpp files to 'i18n'.

[EGD-4167] Add n display languages loaded from files (#1047)

[EGD-4517] Added Text Up/Down navigation with tests. (#1089)

[EGD-4507] RichText CustomTokens support added (#1083)

[EGD-4372] Text addition boundaries added with tests. Removed old bounds checking. Text blocks on newlines split issue fixed. Text widgets cleanups. (#1020)

[EGD-3823] Create Popup windows (#946)

-Create bargraph widget
-Create Home modes window
-Create Volume window
-Create Brightness window
-PR changes

[EGD-4407] Text backup and restore added. (#1022)

Minor fix: uppercase network names in topbar (#978)

[EGD-4210] Text newline handling, bounds first refactor, Test fixes. (#944)