Log Message:
Update to 1.20.0:

procman.cpp: Fix build warning: argument 1 null where non-null expected
sysinfo.cpp: Fix build warning: this ‘if’ clause does not guard…
proctable.cpp: Fix build warning: this ‘else’ clause does not guard…
Fix system logo alignment
WidthOfScreen and HeightOfScreen implementation
process table: make search case-insensitive
sysinfo: disable focus in all labels
avoid deprecated gdk_screen_width/height
sysinfo: avoid deprecated GtkAlignment
Translations update