Mia-accounting

Revised account title capitalization to capitalize account titles upon initialization of base accounts, rather than when displaying the accounts. This prevents the system from incorrectly capitalizing titles of user-added accounts.

For existing installation, run the "accounting-titleize" console command to capitalize the existing account titles that were already initialized.

Other fixes:

* Added missing documentation to the global variables, class properties, and object properties.
* Various minor fixes.

Bug fixes.

* Fixed the return URI of the creation forms to decode the next URI.
* Fixed the unmatched offset list to use the encoded next URI.

Security fixes.

* Revised the next URI utilities to encode and decode the next URI preventing tampering with the next URI.
* Added the integrity value of the CDN stylesheet links.
* Various fixes.

Security fixes.

* Added safeguard to the next URI utilities, to prevent Cross-Site Scripting (XSS) attacks.
* Applied the safe next URI utilities to the test site.
* Added the SameSite and Secure flags to the session cookie of the test site.

* Fixed the error of the net balance in the unmatched offset list.
* Revised the original line item editor not to override the existing amount when the existing amount is less or equal to the net balance.

* Fixed the error of the net balance in the unmatched offset list.