Extra assurance

It doesn't iterate elements more than once.
Make sure cleanup errors don't halt unloading

It would leave plugins in a half-loaded state.
Typo
Make sure rows being returned are valid
Remove event name from report

It doesn't help/work.
Tweaked close button look slightly

It now sits flush at the end of the title bar.
Fix duplicate entries in plugins list
Merge pull request #402 from Person8880/develop

Fix duplicate entries in all plugins list