Adjust the size of the elements in the statusbar

Use the same height for all the elements and try to prevent
variations of the speed labels.
Show current speed limits in the status bar

Closes #1316.
Add setting to ignore RSS rule matches for X days
GUI: Streamline Properties Widget. Closes #2159

Merge select buttons and filtering into one line
Add hotkeys and buttons for Top and Bottom priorities
Merge pull request #802 from Gelmir/rss_match_time_limit

Add setting to ignore RSS rule matches for X days
Merge pull request #2206 from alfrix/prio_buttons

Add top and bottom priority hotkeys and buttons to menu and toolbar
Follow project coding style. Issue #2192.
Fix backtrace generation on Mingw: to resolve local functions we need to export them
Fix indentation for long addresses and filenames
Merge pull request #2210 from alfrix/gui_fix

GUI: Streamline Properties Widget. Closes #2159
Produce demangled backtraces under MinGW
Always disable ASLR for debug builds - otherwise debugging will fail
Merge pull request #2214 from Gelmir/trace

Fix backtrace functionality under MinGW
Merge pull request #2061 from pmzqla/speed-indicators

Show current speed limits in the status bar
Resize and crop the icons used in the status bar.
Let Qt decide the size of the statusbar.
Enable backtrace support for mingw builds too.