Various UI improvements

1. Add consistent set of StatusTips / ToolTips
2. Move Refresh from View to Tools (its an action not changing view)
3. Rename and resequence Help menu.
4. Make sequence of files in a directory in Unmatched files be alphabetical (which should match album track sequence)
5. Make History text more consistent and user friendly and add Remove Album message.
6. Add Open Collection in Browser and reload collection if user details are changed in options
Swap Add Files/Directory...

... to reflect likely priority of usage i.e. most people will load
directories rather than files.
Address zas comments
Address Bitmap comments.
Address more Bitmap comments
Address even more Bitmap comments

Keep them coming Michael - every review comment = an improvement.
Fix tab order which I failed to adjust.
And some more Bitmap comments...

which didn't show on the GitHub comments page.
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