Conditions for automatically skipping NPCs

[focustense]

Was just looking at a few examples and this came to mind. There's a case where EasyNPC is doing nothing interesting with an NPC, and in this case it should skip them: When the default plugin is the last plugin in the load order to modify that NPC, and either of the following are true:

• The face plugin is the same as the default plugin
• The face plugin is the originating master and the default plugin doesn't modify face attributes (has same face as the originator)

In this case, EasyNPC would just be creating an ITM, and possibly a useless facegen to boot. Even if the default plugin has a facegen, despite not having face edits in the plugin, EasyNPC still doesn't need to copy it because, as a master, the default plugin/mod is going to remain installed.

It's minor, but this would have helped with workarounds for some of the children issues in #60, could have been a way to prevent those children from ever being added to the output mod, but without this feature that won't work.

This is separate from the request to manually exclude NPCs. This would automatically exclude NPCs that aren't being modified in any interesting way.

[Killing-J0ke]

Being able to manually skip any character would be useful too.

[llyarc]

If one npc template has another npc, using a different face in this case may cause problems. I'm not quite sure how the template works exactly but it should be a point worth noting, maybe skipping them or giving them the same face automatically