Scite_Portable revisited

.. Finished scite.portable patch which enhances Scites Startup procedure as follow:

1. First: Check for $(env.scite_userhome) for a Path to use. Override with Env. vars %scite_home% / %scite_userhome%.
2. Second: Check the Directory, from which Scite was started. Use that, if ScITEGlobal.properties was found.
3. Third: Check for the Folder %USERHOME%\.Scite. If that exists, just use that.
   Sounds easy... i thought too. but that ONE was a really tough nut to crack for me.

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But now it does greatly improve Scites startup flexibility.
Just do what you need, and it will coope out of the Box in allmost every usecase. Woh.

// yo.. 
filepath takes and returns (gui_string) which is a  basic_wstring (wchar_t)
that converts from (std::wstring) Unicode loves to entertain me..
..