v0.2.0 – Drawing style after DIN 1356-1

Adds the drawing style for German construction drawings at 1:50 to the template of v0.1.0.

• style/din.css – line weights and hatching by material category, layer by layer (structural 0.50, other layers 0.25, hatch 0.10); Arial 3.5 mm. Covers all 19 categories used in the template.
• style/din-patterns.svg – twelve hatch patterns din-*.
• style/titleblocks/ – sheet frames A4 to A0 after DIN 824 form A with fold marks and a title block with placeholders; rebuilt by scripts/build_titleblocks.py.
• scripts/install_style.py – merges the style into Bonsai's own default.css and patterns.svg (data dir or one project); running it again replaces only its own addition.
• German guide for trainers: installation, drawing style, adding a hatch, own title block.

Checked with Bonsai 0.9.1 on a plan drawn from the template. Not yet calibrated on a print. Hatches as real line paths, timber cross, waterproofing band and German dimension figures need a post-processing step and follow later.