refactor: clean up some warnings

Dalamud/Plugin/PluginDefinition.cs

@@ -8,14 +8,49 @@ namespace Dalamud.Plugin
 {
     public class PluginDefinition
     {
+        /// <summary>
+        /// The author/s of the plugin.
+        /// </summary>
         public string Author { get; set; }
+
+        /// <summary>
+        /// The public name of the plugin.
+        /// </summary>
         public string Name { get; set; }
+
+        /// <summary>
+        /// The internal name of the plugin, which should match the assembly name of the plugin.
+        /// </summary>
         public string InternalName { get; set; }
+
+        /// <summary>
+        /// The current assembly version of the plugin.
+        /// </summary>
         public string AssemblyVersion { get; set; }
+
+        /// <summary>
+        /// A description of the plugins functions.
+        /// </summary>
         public string Description { get; set; }
+
+        /// <summary>
+        /// The version of the game this plugin works with.
+        /// </summary>
         public string ApplicableVersion { get; set; }
+
+        /// <summary>
+        /// An URL to the website or source code of the plugin.
+        /// </summary>
         public string RepoUrl { get; set; }
+
+        /// <summary>
+        /// Whether or not the plugin is hidden in the plugin installer.
+        /// </summary>
         public bool IsHide { get; set; }
+
+        /// <summary>
+        /// The API level of this plugin. For the current API level, please see <see cref="PluginManager.DALAMUD_API_LEVEL"/> for the currently used API level.
+        /// </summary>
         public int DalamudApiLevel { get; set; }
     }
 }

Dalamud/Plugin/PluginManager.cs

@@ -12,7 +12,7 @@ using Serilog;
 namespace Dalamud.Plugin
 {
     internal class PluginManager {
-        public const int DALAMUD_API_LEVEL = 1;
+        public static int DALAMUD_API_LEVEL = 1;
 
         private readonly Dalamud dalamud;
         private readonly string pluginDirectory;