Patch from PR 32 from jonfreedman with additional changes and cleanups

- Add Tailable interface to tail files accessed using alternative
libraries such as jCIFS or commons-vfs.
- Changes to the PR:
- Use Objects.requireNonNull() instead manual checks.
- Normalize Javadoc.
- Add missing Javadoc.
- Add missing Javadoc tags.
- Sort members.
- Don't initialize ivars to defaults.
- Renamed some types, ivars, and params.
- Fix some Javadoc.
- No need to use FQCNs in Javadoc @link.
- Use {@code} instead of <code></code>.
- YAGNI: Remove some methods that are not tested and never called.
- Re-implement some internals using NIO.
- Add some constructor parameter validation.
- Add a toString() methods.

Author: Gary Gregory

src/changes/changes.xml

@@ -196,6 +196,9 @@ The <action> type attribute can be add,update,fix,remove.
         Add and use PathUtils.sizeOfDirectory(Path)
         Add and use PathUtils.sizeOfDirectoryAsBigInteger(Path)
       </action>
+      <action dev="jonfreedman" type="add" due-to="Jon Freedman, Gary Gregory">
+        Add Tailer.Tailable interface to allow tailing of remote files for example using jCIFS.
+      </action>
       <!-- UPDATE -->
       <action dev="ggregory" type="add" due-to="Gary Gregory">
         Update FileEntry to use FileTime instead of long for file time stamps.
@@ -273,7 +276,7 @@ The <action> type attribute can be add,update,fix,remove.
       </action>
       <!-- UPDATE -->
       <action dev="ggregory" type="update" due-to="Dependabot">
-        Bump mockito-inline from 3.11.0 to 3.11.2 #247. 
+        Bump mockito-inline from 3.11.0 to 3.11.2 #247.
       </action>
       <action dev="ggregory" type="update" due-to="Dependabot">
         Bump jmh.version from 1.27 to 1.32 #237.
@@ -312,7 +315,7 @@ The <action> type attribute can be add,update,fix,remove.
         Bump checkstyle from 8.42 to 8.44 #241, #248.
       </action>
       <action dev="ggregory" type="update" due-to="Dependabot">
-        Bump mockito-inline from 3.10.0 to 3.11.0 #242. 
+        Bump mockito-inline from 3.10.0 to 3.11.0 #242.
       </action>
     </release>
     <release version="2.9.0" date="2021-05-22" description="Java 8 required.">