Convert plRegistryNode stuff to plString.
Fix issues pointed out in code review.
Fix memory leaks.
Fix a major plStringStream bug, and add an SSO-like optimization to it
Add plString::Replace
Merge pull request #254 from zrax/plstring-replace

Add plString::Replace
Fix issues from review
Merge pull request #253 from zrax/plString

Fix a major plStringStream bug, and add an SSO-like optimization to it.
Fix format string here.
Some fixes to make it all compile.
Merge pull request #251 from dpogue/plresmgr-strings

Convert plRegistryNode stuff to plString.
Fix the "Crash on Exit" bug

We were throwing away the Dispatcher before all the keys (namely, leaked
keys) were unloaded. See the comment in plResManager for more details.
Replace plasmalog with a better debug log

Plasmalog.txt is now plasmadbg.log. This allows us to view the log inside
the game, flush to the debugger output window, and have the logfile. The
plan is to redirect key leak reports to this log in a future commit.
Remove Cruft
Fix issues from review

- Delete the TypeFilter pointers