Themes are now loaded from the following directories:
1. Directory "themes" in user profile
2. Directory "themes" in root profile directory
3. System data path
> /usr/share/qupzilla/themes on Linux
> $EXECUTABLE_DIR/themes on Windows
Closes#928
Code was formatted with patched astyle that correctly formats
foreach macro.
Normalize tool is now used to normalize all signal/slots signatures
to normalized format. It saves few reallocations on connections.