Java 16 support - Change log 5.4 build 1330

This update adds Java 16 support, removes H2, updates many locales and fixes various bugs.

Special thanks to Kopo, 4drian3d, EyuphanMandiraci, 10935336, 洛伊, Sander0542 and portlek for contributing to this update.

Change log
Java 16 support
Runtime dependencies are no longer downloaded, so the reflection error goes away, and with it Java 16 is now compatible.

Removed H2 support
H2 has been deprecated for a while now, and the database drivers are removed in this update.
If you still haven't migrated despite the big warning during enable, do so with /plan db move h2 <sqlite / mysql> before updating. This database was very prone to corruption and that's the main reason it was phased out.

Option to warm up Plan placeholders
'Plugins.PlaceholderAPI.Load_these_placeholders_on_join' setting allows warming up Plan placeholders in case you are using some plugins that run placeholder replacement on server thread. This should reduce the need to replace things twice, but you need to add the specific placeholders to this list.

Removed SQLite drivers for android-arm and DragonflyBSD
To keep jar under size limits these two drivers had to be removed (I hope nobody runs Plan on a phone or TV).
Metrics said there were 2 FreeBSD users, but they are unaffected since drivers for that is still included.

Locale

• Added Traditional Chinese (ZH_TW) locale by 洛伊
• Added Dutch (NL) locale by Sander0542
• Simplified Chinese locale updated by 10935336
• Turkish locale updated by EyuphanMandiraci
• Spanish locale updated by 4drian3d

Website

• Added /errors and /v1/errors to view recent Plan error logs in the browser
• Fixed tab navigation going under the "close sidebar" area on some phones [all builds]
• Fixed South Korea not getting color on the map [all builds]

Extensions

• Fixed LogBlock Extension not getting any data [all builds]
• Fixed PlotSquared Extension throwing error sometimes [builds 1284+]
• Possibly fixed Tebex Extension throwing error sometimes [builds 1284+]
• portlek fixed a NPE related to DiscordSRV Extension [all builds?]

Other

• Kopo updated Plan to build with Gradle 7
• jQuery is now served via CDN to reduce jar size.