Bugfix: Allows you to open files with the same filenames

It used wxFileName::GetFullName() when it should have been using wxFileName::GetFullPath().

wxFileName::SameAs() is even better.

This bug may also need to be fixed in MainFrame::GetFileMatchingSource
Merge branch 'dev' of https://github.com/unknownworlds/decoda into bugfix
Fixed a bug where "Loading Symbols" was shown at startup because of the default blank project
reverted an old change to commit a bugfix
Tabs -> spaces