Fix build with latest libptytty.
Fix undefined behaviour in auto_str usage.

The operand of 'delete' cannot be a pointer to an array object. Fix the
bug by using malloc/free rather than new/delete.
Fix height mismatch between active and inactive cursor when lineSpace is non zero, patch by Stanislav Seletskiy.
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Do not add lineSpace to the maximum font height as lineSpace should
modify the line height only.
Remove deprecated libAfterImage image backend.
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Simplify.
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Simplify.
Cosmetics.
Update Changes.
Simplify.
Fix disabling of cursor blink with the option-popup menu.

Based on a patch by Jan Larres.
Update Changes.
Fix build.
Fix indent.
Use lerp in make_align_position and do not change the intervals when
window_size < image_size.