Given a selection of lines, this function finds groups of lines linked together
| inputLines | array of Line | |
| linePaths | array of array of Line | linked together |
| lineDirections | optional array of arrays of booleans | representing line directions for lines in a path |
| isClosedLoop | optional array of booleans | one for each line path (true if the lines in a path form a closed loop, false for open) |
| Return value | int | number of closed line paths |
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