- new file item_type_filters.dart for the hiddenItemTypes function.
- reduces code duplication in statistics_screen, categories_screen and base_library_tab_screen
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.
- 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
- 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 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.
- 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.
- Using round() will push values up too early.
Example: log(999) / log(1024) = 0.999
.round() = 1.
Result: 0.98 kB instead of 999 B
- Use correct units, as base1024 = KiB, MiB, etc. and base1000 = kB, MB, GB, ...
- Move the cacheDir creation to storage_provider from `others.dart`, `custom_extended_image_provider.dart` and `storage_usage.dart`.
- Use the correct directory, `getApplicationCacheDirectory()` instead of the `getTemporaryDirectory()` (which is being deleted by the OS regularly) for cache files.
- remove the `_cacheDownloadPath` from `storage_usage.dart` as the path is never being created in the first place, so using that path in `clearCache()` and `_getTotalDiskSpace()` is unnecessary.
