Smiley fix (part 1 from issue #83)

Fixes first point in issue #83:

* Move the default smiley pack into a resource directory and treat it just as if it was located in a file system, instead of hardcoding the config for the smiley pack in cpp. That would also allow the default slimey pack to be moved out of .exe if needed without any trouble.

Solution:
* /resources/icon/theme.th file has been created. Contains previous default smiley pack info.
* Removed default smiley pack from smileypack.cpp.
* Added extension type .th to identify theme files.
* scans two directories for theme files: ~/.config/ and ../resources/icon/