Add extraction for installshield executables. (#27)

* Add extractor for installshield executables.

* Add comment

* Fix intendation.

* Ensure PRs recursively pull

* Rebase

* Fix formatting for parsex

* newline before obj.name

* Changed while loop check to a position vs length check

* Specify type for chunkSize

* declare chunksize as a const int outside of the loop

* Open file writer with using

* Call fs.flush after every write.

* Improved chunk writing loop.

* Remove now-unecessary variable

* Properly handle extracting files of size greater than int32.

* Use long for overlay address

* create deserializer outside of loop.

* Move null check.

* Don't cache position.

---------

Co-authored-by: Matt Nadareski <mnadareski@outlook.com>

SabreTools.Serialization/Models/InstallShieldExecutable/ExtractableFile.cs

@@ -0,0 +1,25 @@
+namespace SabreTools.Data.Models.InstallShieldExecutable
+{
+    public class ExtractableFile
+    {
+        /// <summary>
+        /// Name of the file, only ASCII characters(?)
+        /// </summary>
+        public string? Name { get; set; }
+
+        /// <summary>
+        /// Path of the file, only ASCII characters(?), seems to usually use \ filepaths
+        /// </summary>
+        public string? Path  { get; set; }
+
+        /// <summary>
+        /// Version of the file
+        /// </summary>
+        public string? Version { get; set; }
+
+        /// <summary>
+        /// Length of the file. Stored in the installshield executable as a string.
+        /// </summary>
+        public ulong Length { get; set; }
+    }
+}