* clock manager: wrap panel to run on swing thread
* Add splash screen to Runelite
Although RuneLite is still fast at loading, it's more user friendly
for at least something to pop up before the client.
There is also an option (-no-splash) to disable the splash screen.
This uses psikoi's design.
* splash screen/client ui: don't set up theme twice
Setting up the look and feel of RuneLite shouldn't happen twice, so
check to see if it has already been set up before setting up the look
and feel.
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