FIX: Read only the first lines of svg for parsing.

Before this we read all file and then parsed lines which
made the svg parsing very slow, when the file was big
GUI: Testing new behavior on editing text elements. Now when they have
focus they are editable by default.
GUI: Change slider label to entry to allow quick set of quality
GUI: Small UX improvements
ADD: Collage custom name string.
FIX: Minor fix on string match for label, prepCollage
Minor GUI margin arrangement

Collage custom can be feed with the following substitution chars
%d day
%m month
%y year
%D date yyyy-mm-dd