Add machine-readable annotation to describe dynamic default values su…

…ch that DocGen can display a description of how that default value is computed instead of the default value used by the build agent building the documentation.

Fix description of nls Parameter (it didn't specify that it was an option and which setting caused LF vs CLRF).

src/org/jetbrains/java/decompiler/main/extern/IFernflowerPreferences.java

@@ -193,7 +193,8 @@ public interface IFernflowerPreferences {
   String USER_RENAMER_CLASS = "urc";
 
   @Name("New Line Seperator")
-  @Description("Character that seperates lines in the decompiled output.")
+  @Description("Use LF line-endings if enabled, CRLF otherwise.")
+  @DynamicDefaultValue("Disabled on Windows, enabled on other systems")
   String NEW_LINE_SEPARATOR = "nls";
 
   @Name("Indent String")
@@ -214,6 +215,7 @@ public interface IFernflowerPreferences {
 
   @Name("Thread Count")
   @Description("How many threads to use to decompile.")
+  @DynamicDefaultValue("all available processors")
   String THREADS = "thr";
 
   String DUMP_ORIGINAL_LINES = "__dump_original_lines__";
@@ -347,4 +349,10 @@ static Map<String, Object> getDefaults() {
   public @interface Description {
     String value();
   }
+
+  @Retention(RetentionPolicy.RUNTIME)
+  @Target(ElementType.FIELD)
+  public @interface DynamicDefaultValue {
+    String value();
+  }
 }