When specifying a filename as an argument, you can append a colon (or a
plus) followed by a number to indicate which line the cursor should be
positioned at in that file. This patch adds the same functionality but
for the column position as well. Ex: main.cpp:5:4 would open main.cpp
and put the cursor at line 5 column 4. The column number is optional,
just like the line number before it. It should be noted that specified
column numbers larger than the amount of characters available on that
line are wrapped onto subsequent lines.

Change-Id: I50208500fa43e43a9514d2be21630b3c607119a6
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>
Reviewed-by: hjk <hjk@theqtcompany.com>