* Fixed type narrowing issues

This built correctly before because tests were run with the highgui module enabled.
The sfm module links against the features2d module, which brings in the highgui module as an optional target if enabled.
Through this path, imread was working correctly despite the file including the wrong header and not declaring its linking dependency.

* Fixed typo

* Resolved the typo and trailing space error

Expose line descriptor python (#1994)

* Created wrappers for other line_descriptor functions/classes

* Changes to expose LSD and EDLines params in Python and make line descriptor available in Python

* Fix spelling of perpectiveRemovePixelPerCell in struct docstring

* Fix spelling of perpectiveRemovePixelPerCell in detection tutorial

Resolves #1963

so meshes in any orientation can be properly viewed