- Use the logger to log failed updates

- After the update-botToast another botToast is being spawned to show exactly which manga(s) couldn't be updated.

- Remove the doWhile loop because it is unnecessary. The condition of mangaList.length == numbers is always true, meaning it only runs once.

No need to pass hideItems down, they all can use the top hideItems variable. It's never changed.

Use getCurrentItemType() method to determine the ItemType of the current tab instead of the conditional with `_tabBarController.index`, which doesn't take into account that there could be hidden tabs.

The previous version was just unnecessarily complicated, hard to read.
New version is very easy to read.

- Change _tabList String-list to be a list of ItemType
- Change its name to _visibleTabTypes
- Use that list in getCurrentItemType(), instead of creating a new list

Use the _visibleTabTypes list instead of the repeated if-statements.

- remove hideItems parameter
- Make TabBar and TabBarView cleaner

Reduce duplication

- Extract localizedItemType() from `base_library_tab_screen.dart`
- Add localizedSources() and localizedExtensions() for browse_screen.dart
- Reduce if-statements in statistics_screen.dart
- Reduce if-statements in categories_screen.dart
- Reduce if-statements in browse_screen.dart

The "Show extensions" Button was not working properly when categories were hidden.
An Exception would throw:
```
_AssertionError ('package:flutter/src/material/tab_controller.dart': Failed assertion: line 202 pos 12: 'value >= 0 && (value < length || length == 0)': is not true.)
```
And jump to the end of the tab list regardless of where you clicked the button.

- new file item_type_filters.dart for the hiddenItemTypes function.
- reduces code duplication in statistics_screen, categories_screen and base_library_tab_screen

_updateCategoriesOrder() is now async

When rearranging categories in the Manga library, all categories in Anime and Novel were being deleted.

And add comments

When the user has hidden Manga or Anime or Novel, hide the buttons in the calendar.

Don't show manga calendar if manga is hidden.

for better readability

- compare integers instead of Strings
- cache results per day

- avoids extra text file
- simplify RenderBox lookup