[Editor] Loading bar

[Greendogo]

When you click "Create a New Addon" or "Edit a Content File", it can take a while to load the content into the editor and this causes the window to "not-respond" and you have no indication of your wait time.

I suggest a simple loading bar should replace the open-content dialogue during the loading operation, and also fix the "not-responding" (at least on windows) issue.

I also kind of expected there to be more of an indication of activity in the terminal during startup, but this was all that was there:

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Loading config file: C:\Users\Greendogo\Documents\My Games\openmw/openmw.cfg... done.

Loading config file: ./openmw.cfg... done.

A loading indicator might be nice there too.

[Zini]

https://bugs.openmw.org/issues/649

[Greendogo]

Ha, oh, I need to go to sleep.

[pvdk]

For someone interested in implementing it: I used a thread for the libunshield stuff in the Wizard. As far as I know this is the right way to use QThread. The documentation on QThread still tells you to subclass it, which is the wrong way of doing things.

See this file in my wizard branch.