Added saving of last cleaning options from wizard, GUI.
Added 'custom' preset, used to store custom options.
Added duplicate clipPath removing.
Split transformations matrix applying into two keys. One for defs and
one for paths.
Applying transformations into path disabled by default.
A lot of changes in paths processing.
Added removing of elements without fill and stroke, because it's
invisible.
Id trimming func now use 0-9A-Za-z sequence of chars, instead of hex.
Some speed optimizations.
0.02% better cleaning