Detect UnsupportedClassVersionErrors in newer versions of Paper

[pavog]

In older versions of Paper the message is:

Could not load 'plugins/Slimefun4-1027.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: io/github/thebusybiscuit/slimefun4/implementation/Slimefun has been compiled by a more recent version of the Java Runtime (class file version 60.0), this version of the Java Runtime only recognizes class file versions up to 52.0

In newer versions of Paper the message is:

Could not load plugin 'worldedit-bukkit-7.3.4-beta-01.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: com/sk89q/worldedit/bukkit/WorldEditPlugin has been compiled by a more recent version of the Java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 61.0

This PR adds a regex pattern to also detect the new message.
This PR also changes the old regex pattern so that both patterns return the same matches and the function setMatches can process matches for both patterns in the same way.
In this case these are:

• File name of the plugin (e.g. worldedit-bukkit-7.3.4-beta-01.jar)
• Name of the plugin (e.g. worldedit-bukkit-7.3.4-beta-01)
• Name of the folder (e.g. plugins)
• Class file version (e.g. 65)