Add comments to the new configuration classes.

core/src/main/kotlin/org/nwapw/abacus/config/Configuration.kt

@@ -1,7 +1,20 @@
 package org.nwapw.abacus.config
 
+/**
+ * A class that holds information that tells Abacus how to behave.
+ *
+ * Configuration stores information about how Abacus should behave, for
+ * instance, what number implementation it should use and what
+ * plugins should be ignored during loading.
+ *
+ * @property numberImplementation the number implementation Abacus should use for loading.
+ * @param disabledPlugins the plugins that should be disabled and not loaded by the plugin manager.
+ */
 open class Configuration(var numberImplementation: String = "<default>", disabledPlugins: Array<String> = emptyArray()) {
 
+    /**
+     * The set of disabled plugins that should be ignored by the plugin manager.
+     */
     val disabledPlugins = disabledPlugins.toMutableSet()
 
 }

fx/src/main/kotlin/org/nwapw/abacus/fx/ExtendedConfiguration.kt

@@ -5,25 +5,53 @@ import com.moandjiezana.toml.TomlWriter
 import org.nwapw.abacus.config.Configuration
 import java.io.File
 
+/**
+ * Additional settings for user interface.
+ *
+ * ExtendedConfiguration is used to add other settings
+ * that aren't built into Abacus core, but are necessary
+ * for the fx module.
+ *
+ * @property computationDelay the delay before which the computation stops.
+ * @param implementation the number implementation, same as [Configuration.numberImplementation]
+ * @param disabledPlugins the list of plugins that should be disabled, same as [Configuration.disabledPlugins]
+ */
 class ExtendedConfiguration(var computationDelay: Double = 0.0,
                      implementation: String = "<default>",
                      disabledPlugins: Array<String> = emptyArray())
     : Configuration(implementation, disabledPlugins) {
 
     companion object {
+        /**
+         * The default TOML.
+         */
         val DEFAULT_TOML_STRING = """
             computationDelay=0.0
             implementation="naive"
             disabledPlugins=[]
             """
+        /**
+         * A reader with the default TOML data.
+         */
         val DEFAULT_TOML_READER = Toml().read(DEFAULT_TOML_STRING)
+        /**
+         * A writer used to writing the configuration to disk.
+         */
         val DEFAULT_TOML_WRITER = TomlWriter()
     }
 
+    /**
+     * Constructs a new configuration from a file on disk.
+     * @param tomlFile the file from disk to load.
+     */
     constructor(tomlFile: File) : this() {
         copyFrom(Toml(DEFAULT_TOML_READER).read(tomlFile).to(ExtendedConfiguration::class.java))
     }
 
+    /**
+     * Copies data from another configuration into this one.
+     * @param config the configuration to copy from.
+     */
     fun copyFrom(config: ExtendedConfiguration) {
         computationDelay = config.computationDelay
         numberImplementation = config.numberImplementation
@@ -31,6 +59,10 @@ class ExtendedConfiguration(var computationDelay: Double = 0.0,
         disabledPlugins.addAll(config.disabledPlugins)
     }
 
+    /**
+     * Saves this configuration to a file.
+     * @param file the file to save to.
+     */
     fun saveTo(file: File) {
         DEFAULT_TOML_WRITER.write(this, file)
     }