Start the Plugin interfaces

By: Dinnerbone <dinnerbone@dinnerbone.com>

paper-api/src/org/bukkit/plugin/Plugin.java

@@ -0,0 +1,33 @@
+
+package org.bukkit.plugin;
+
+/**
+ * Represents a plugin
+ */
+public abstract class Plugin {
+    private boolean isEnabled = false;
+
+    /**
+     * Returns a value indicating whether or not this plugin is currently enabled
+     * 
+     * @return true if this plugin is enabled, otherwise false
+     */
+    public final boolean isEnabled() {
+        return isEnabled;
+    }
+
+    /**
+     * Called when this plugin is enabled
+     */
+    protected abstract void onEnable();
+
+    /**
+     * Called when this plugin is disabled
+     */
+    protected abstract void onDisable();
+
+    /**
+     * Called when this plugin is first initialized
+     */
+    protected abstract void onInitialize();
+}

paper-api/src/org/bukkit/plugin/PluginLoader.java

@@ -0,0 +1,48 @@
+
+package org.bukkit.plugin;
+
+import java.io.File;
+
+/**
+ * Represents a plugin loader, which provides access and management for all plugins
+ * currently loaded on a server instance
+ */
+public interface PluginLoader {
+    /**
+     * Checks if the given plugin is loaded and returns it when applicable
+     *
+     * Please note that the name of the plugin is case-sensitive
+     *
+     * @param name Name of the plugin to check
+     * @return Plugin if it exists, otherwise null
+     */
+    public Plugin getPlugin(String name);
+    /**
+     * Checks if the given plugin is enabled or not
+     *
+     * Please note that the name of the plugin is case-sensitive.
+     *
+     * @param name Name of the plugin to check
+     * @return true if the plugin is enabled, otherwise false
+     */
+    public boolean isPluginEnabled(String name);
+
+    /**
+     * Checks if the given plugin is enabled or not
+     *
+     * @param plugin Plugin to check
+     * @return true if the plugin is enabled, otherwise false
+     */
+    public boolean isPluginEnabled(Plugin plugin);
+
+    /**
+     * Loads the plugin contained in the specified file
+     *
+     * File must be a .jar and contain a valid plugin.yaml file
+     *
+     * @param file File to attempt to load
+     * @return Plugin that was contained in the specified file, or null if
+     * unsuccessful
+     */
+    public Plugin loadPlugin(File file);
+}