add harmonic armature guide #359
Merged
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Based on guide I made here: https://discuss.pixls.us/t/add-custom-guides/26288/10?u=johnny-bit
It's actually harmonic armature guide and not dynamic symmetry guide.
How to use harmonic armature: https://www.thomaskegler.com/files/documents/compostion.pdf
additionally this essentially fixes darktable-org/darktable#3139 since adding new guides via lua is good way.
@wpferguson - one question: i commented out the unnecessary middle lines (harmonic armature doesn't use middle lines), but i've seen places where they select and create additional lines. In normal c-coded darktable guides, the widgets allow for options but i have no idea how to add those in lua. I'd love to have this merged as-is and add options later if ever.