chore: update phpstan version and remove phpstan-baseline

See merge request !36

Several changes have been made across multiple files to enhance code readability and follow safer
coding practices.

1. Breakdown of long lines of attributes/code into multiple lines with added comments for better
readability. This was done in Submenu.php

2. Replaced '==' operation with 'empty()' function to check for empty strings in Submenu.php

3. Safer checking of if method 'getCachePath' exists on 'getSite' to avoid potential errors &
Ensure the last insert ID is always an integer in the database PDO in DropDownMenu.php and
Factory.php

4. Refactor conditions for more clear type hinting in multiple files; including
Independent/Handler.php, Independent/Items/AbstractMenuItem.php, Independent/Items/Site.php,
Independent/Menu.php, MegaMenu.php, and NavTabs.php

The concept of safe concatenation or use of '|null|' has been introduced where needed across many
files.

Related: #38

This commit updates the version of phpstan specified in .phive/phars.xml file to 1.* and the
current installed version to 1.12.13.

Additionally, it removes all the previously ignored errors in phpstan-baseline.neon. The actions
were taken possibly due to fixes to these errors or related update in the codebase causing them to
be obsolete.

Please ensure related checks/errors do not surface again due to the removed baseline ignores.

fix(FloatedNav): cannot read of null

See merge request !35

Next 3.x

See merge request !33

Add QUIQQER Tooling

See merge request !28

Next 3.x

See merge request !32

feat: add submenu control and brick

See merge request !29

Next

See merge request !27

fix: quiqqer/quiqqer locale and paths adapted to quiqqer/core

See merge request !26

feat!: quiqqer v2

See merge request !25

feat!: quiqqer v2

See merge request !24

feat!: quiqqer v2

See merge request !23

Next

See merge request !22

feat(MegaMenu): add new property "short description" in independent menu

See merge request !21

BREAKING CHANGE: quiqqer v2 has been renamed to quiqqer/core. a new major version will be created here so that we can still develop for both versions.