New registry API, breaks existing API

...java/net/islandearth/rpgregions/effects/RegionEffect.java

.../islandearth/rpgregions/managers/IRPGRegionsManagers.java

...rth/rpgregions/managers/registry/IRPGRegionsRegistry.java

...dearth/rpgregions/requirements/DependencyRequirement.java

...slandearth/rpgregions/requirements/RegionRequirement.java

...a/net/islandearth/rpgregions/rewards/DiscoveryReward.java

.../src/main/java/net/islandearth/rpgregions/RPGRegions.java

...et/islandearth/rpgregions/commands/RPGRegionsCommand.java

...et/islandearth/rpgregions/effects/PotionRegionEffect.java

.../islandearth/rpgregions/effects/RegionEffectRegistry.java

...t/islandearth/rpgregions/managers/RPGRegionsManagers.java

...arth/rpgregions/managers/registry/RPGRegionsRegistry.java

...earth/rpgregions/requirements/AlonsoLevelRequirement.java

...islandearth/rpgregions/requirements/LevelRequirement.java

...islandearth/rpgregions/requirements/MoneyRequirement.java

...earth/rpgregions/requirements/PlaceholderRequirement.java

...th/rpgregions/requirements/RegionRequirementRegistry.java

...net/islandearth/rpgregions/rewards/AlonsoLevelReward.java

.../islandearth/rpgregions/rewards/ConsoleCommandReward.java

.../net/islandearth/rpgregions/rewards/ExperienceReward.java