Symbols are reloaded anytime any config changes

[AaronOpfer]

If you open the settings dialog, change any setting, and then click OK, edb reloads all of the symbols causing a noticeable delay before the UI starts responding again.

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[eteran]

Yea, so we do that because the user may have changed the symbols directory. We could probably remember the previous value and reload only if it is actually changed.