Final release for 1.3.5 merge.

Completed to merge all differences between original FLTK 1.3.5 and previous version of my 1.3.4-2-ts.
See DIFFERENCE.

Release for 1.3.5-2 upgraded from 1.3.4-2.

Many issues solved ( but many bugs still left as like 1.3.5rc2 ) from 1.3.4-2.
Most of updgrades belong to original verison of 1.3.5rc2.
All codes tested on MacOSX mojave.