Convert templates to “compound” tags

[thiccaxe]

Building on the ideas of KyoriPowered/adventure-text-minimessage#178 & KyoriPowered/adventure-text-minimessage#179 , this will greatly enhance the flexibility of templates.

new syntax for templates:
<template>text with "bleeded" styles of template</template>regular text

In essence, a template is no longer a string that is replaced, but a full tag.
Unlike a simple <red>, however, a template can contain its own styles, text, click events, translations, or even templates inside it.

i.e.: if <template> was defined as <red><bold>Prefix</bold>,
The first example would be equivalent to writing out:

<red><bold>Prefix</bold>text with "bleeded" styles of template</red> regular text

As previously stated, this greatly expands the flexibility of templates and improves minimesaage overall

[zml2008]

This should be fixed by #672