* Add PHPUnit test for LibreNMS Discord transport
* Style
* Adding comments for methods and others.
* Refactor title, color, embedFields and footer to its own methods.
Renaming and comments.
* testDiscordDelivery includes img and html tags.
* testDiscordDelivery tests INI options
* renamed getter methods for clarity.
Refactor to includeINIFields() method.
* refactor attribute $discord_message;
* Discord.php: Bugfix "Error: Invalid Field" when discord-embed-fields is left empty.
Discord.php: Removed DEFAULT_EMBEDS (defaults are not working with text fields).
DiscordTest.php: transport config tests improved.
* Transport.md: Documented options, images and ebed fields. Better examples.
* typos
* styleCI and PHPStan
* StyleCI
* StyleCI
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