Nyall Dawson a16ab723d5 [feature] Add option to trim the start and end of simple line symbol
layers by a preset amount

This allows for the line rendering to trim off the first x mm
and last y mm from the actual line string when drawing the line.
It can be used eg when creating complex symbols where a line layer
should not overlap marker symbol layers placed at the start
and end of the line.

The start/end trim distance supports a range of units, including
percentage of the overall line length, and can be data defined
for extra control.
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