Warn when input contains legacy formatting codes

[kezz]

Perhaps even just throwing an exception would be nice

[Proximyst]

adventure/api/src/main/java/net/kyori/adventure/text/TextComponentImpl.java

Line 40 in d92fcb2

private static final boolean WARN_WHEN_LEGACY_FORMATTING_DETECTED = Boolean.getBoolean(String.join(".", "net", "kyori", "adventure", "text", "warnWhenLegacyFormattingDetected"));

Isn't this already done?

[kezz]

Yes, but this is disabled by default. MiniMessage could easily have this enabled by default as the reasons why it was disabled by default for the API aren't present when constructing components with MiniMessage.

[MiniDigger]

should only throw exception in strict mode (if thats still a thing? dont remember)