GENERAL:
- Move project from Maven to Gradle (Kotlin DSL)

ADDED:
- Added particle trap.
- Added development build notification.

FIXED:
- Fixed some reflections that may cause exceptions.
- Fixed booster sometimes not work due to invalid static import.

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IMPORTANT! Some API changes happened and some old methods will be removed in next version!

ADDED:
- API#pluginGitBranch(): String
- API#pluginGitCommit(): String

REPLACEMENTS:
- API#instance: API -> API#apiInstance(): API
- API#getVersion(): String -> API#pluginVersion(): String
- API#getTrapRegistry(): ITrapRegistry -> API#trapRegistryInstance(): ITrapRegistry
- ``API#getArena(): IArena -> API#arenaInstance(): IArena
- ITrapRegistry#list(): Set<String> -> ``ITrapRegistry#trapRegistryKeys(): Collection<String>