Just Another Spawner

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Changelog version 0.16.19
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* 2015-04-03: Add JASCA as Optional Library on curse builds
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* 2015-04-03: changelog to changelog not releasetype
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* 2015-05-15: Improve buildscript. Curseforge publishing of artifact and source jars; changelog autogenerated
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| Conflicts:
|     GEN-CHANGELOG.sh
|     build.gradle
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* 2015-05-15: Revision++
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* 2015-05-15: Add Setup_Spawnlistentry logging field to toggle detailed spawnlistentry adding / failing to add (failing only logged in debug mode)
| Close #130
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* 2015-05-15: Add passive spawn rtestriction to chunk spawns.
| This is not typical of vanilla behaviour, but does seem the expected and intutive to users.
| Will result in reduced chunk spawns, but should not heavily influence vanilla mobs.
| Subject to futher feedback.
| #134
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* 2015-05-15: Fix isTame tag to correctly recognize tamed horses
| Fix #131
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* 2015-05-15: Fix log call to actually report information
| Fix #133
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* 2015-05-15: Add check to see if World is null before attempting to determine if location is present.
| Improves compatability with mods that cause the structure objects to not be fully initialized.
| Fix #125
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* 2015-05-15: Add check to overworld structures to only enage when MapGenFeatures are enabled.
| Fixes #132
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* 2015-04-03: Improve buildscript. Curseforge publishing of artifact and source jars; changelog autogenerated