Jhean-François Fournier-Noël

Fixed the headers. I also edited the first method definition for more consistency with the second method example.

feat: Add Wisp Spawner

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This adds the Wisp Spawner to Valheim Plus and allows to configure some of its settings. This PR requires #793 to work, so I added the commits here too.

PBT 0.214.300.3 Compatibility

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> > Here is a zipped version of BepInEx 5.4.21 **with** @Grantapher Valheim Plus fix already added to the plugins folder (`/BepInEx/plugins/ValheimPlus.dll`): [denikson-BepInExPack_Valheim-5.4.2100_ValheimPlusFix.zip](https://github.com/valheimPlus/ValheimPlus/files/10991495/denikson-BepInExPack_Valheim-5.4.2100_ValheimPlusFix.zip). > > I downloaded this zip file...

**Hash.class.php**: Allow mixed return type for `getIterator` as a temporary fix. **Boot.class.php**: Fix several `strpos` calls where passing null to parameters is not allowed anymore.