Allow line creation, deletion, moving and resizing.

app/apps/core/forms.py

app/apps/core/static/js/image_cards.js

app/apps/core/urls.py

app/apps/core/views.py

app/escriptorium/static/css/escriptorium.css

...atic/vendor/jquery/images/ui-bg_glass_20_555555_1x400.png

...atic/vendor/jquery/images/ui-bg_glass_40_0078a3_1x400.png

...atic/vendor/jquery/images/ui-bg_glass_40_ffc73d_1x400.png

...ndor/jquery/images/ui-bg_gloss-wave_25_333333_500x100.png

...or/jquery/images/ui-bg_highlight-soft_80_eeeeee_1x100.png

...vendor/jquery/images/ui-bg_inset-soft_25_000000_1x100.png

...vendor/jquery/images/ui-bg_inset-soft_30_f58400_1x100.png

...m/static/vendor/jquery/images/ui-icons_222222_256x240.png

...m/static/vendor/jquery/images/ui-icons_4b8e0b_256x240.png

...m/static/vendor/jquery/images/ui-icons_a83300_256x240.png

...m/static/vendor/jquery/images/ui-icons_cccccc_256x240.png

...m/static/vendor/jquery/images/ui-icons_ffffff_256x240.png

app/escriptorium/static/vendor/jquery/jquery-3.3.1.min.js

app/escriptorium/static/vendor/jquery/jquery-ui.min.css

app/escriptorium/static/vendor/jquery/jquery-ui.min.js