Implement `gohome` function. Now read URL From registry.

[Ivan Sinisin]

Add implementation of function `gohome` in navigate.c (shdocvw.dll). Now we 
read URL of home page from Registry, but if we cann`t read value from the 
registry, then load `About:blank` page.

Changelog:
This patch add implementation of function `gohome` (navigate.c shdocvw.dll).

-- 
Sinitsin Ivan
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