[MWAR-455] Exploded war task fails on second run when file that was previously read only is updated

**[Seth Wilcox](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=laoseth)** opened **[MWAR-455](https://issues.apache.org/jira/browse/MWAR-455?redirect=false)** and commented

For background, we are using perforce, which marks files as readonly until local modification. As such, when using the exploded target for faster incremental builds, when a file is updated, when the war task attempts to copy the updated resource file, it fails with a accessDenied exception.  If the read only flag is cleared on the target, or the target file that is in the way is removed, the issue is fixed.  I would propose adding a force/override field akin to ant file copy tasks to allow those of us with this specific issue a path around it, while protecting others who may want the read only flag respected

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**Attachments:**
- [stackTrace.txt](https://issues.apache.org/jira/secure/attachment/13046166/stackTrace.txt) (_5.64 kB_)

**Remote Links:**
- [GitHub Pull Request #27
](https://github.com/apache/maven-war-plugin/pull/27)