Add graphic block output from notcurses-info

I think we may have some gaps in our block glyphs; this will
make it more convenient to verify.

test-data/notcurses-gfx.txt

@@ -0,0 +1,13 @@
+Copy and pasted from the output of notcurses-info; it shows a spread of
+block and other graphic glyphs
+
+ ▘▝▀▖▌▞▛▗▚▐▜▄▙▟█⎧ 🬀🬁🬂🬃🬄🬅🬆🬇🬈🬊🬋🬌🬍🬎🬏🬐🬑🬒🬓▌🬔🬕🬖🬗🬘🬙🬚🬛🬜🬝⎫♠♥🯰🯱🯲🯳🯴🯵🯶🯷🯸🯹⅗⅘⅙⅚⅛⎧▕▏⎫┌╥─╥─╥┐🭩
+╲╿╱ ◨◧ ◪◩ ◖◗ ⫷⫸ ⎩🬟🬠🬡🬢🬣🬤🬥🬦🬧▐🬨🬩🬪🬫🬬🬭🬮🬯🬰🬱🬲🬳🬴🬵🬶🬷🬸🬹🬺🬻█⎭♦♣¼½¾⅐⅑⅒⅓⅔⅕⅖⅜⅝⅞⅟↉⎪🮇▎⎪├╜╓╫╖╙┤🭫
+╾╳╼ ◲◱ ◶◵ 🮣🮠 🮤🮥◜◝ ◿◺ 🮞🮟 ◢◣ ┌┐─  ┏┓━ ╭╮─  ╔╗═ 🭽🭾▁ ⩘▵△▹▷▿▽◃◁⭡⭣⭠⭢⭧⭩⭦⭨⎪🮈▍⎪├─╨╫╨─┤┇
+╱╽╲ ◳◰ ◷◴ 🮡🮢 🮦🮧◟◞ ◹◸ 🮝🮜 ◥◤ └┘│  ┗┛┃ ╰╯│  ╚╝║ 🭼🭿🭵 ⩗▴⏶⯅▲▸⏵⯈▶▾⏷⯆▼◂⏴⯇◀⎪▐▌⎪╞═╤╬╤═╡┋
+⎡⠀⠁⠈⠉⠂⠃⠊⠋⠐⠑⠘⠙⠒⠓⠚⠛⠄⠅⠌⠍⠆⠇⠎⠏⠔⠕⠜⠝⠖⠗⠞⠟⠠⠡⠨⠩⠢⠣⠪⠫⠰⠱⠸⠹⠲⠳⠺⠻⠤⠥⠬⠭⠦⠧⠮⠯⠴⠵⠼⠽⠶⠷⠾⠿⎤⎨🮉▋⎬╞╕╘╬╛╒╡┊
+⎢⡀⡁⡈⡉⡂⡃⡊⡋⡐⡑⡘⡙⡒⡓⡚⡛⡄⡅⡌⡍⡆⡇⡎⡏⡔⡕⡜⡝⡖⡗⡞⡟⡠⡡⡨⡩⡢⡣⡪⡫⡰⡱⡸⡹⡲⡳⡺⡻⡤⡥⡬⡭⡦⡧⡮⡯⡴⡵⡼⡽⡶⡷⡾⡿⎥⎪🮊▊⎪└┴─╨─┴┘╏
+⎢⢀⢁⢈⢉⢂⢃⢊⢋⢐⢑⢘⢙⢒⢓⢚⢛⢄⢅⢌⢍⢆⢇⢎⢏⢔⢕⢜⢝⢖⢗⢞⢟⢠⢡⢨⢩⢢⢣⢪⢫⢰⢱⢸⢹⢲⢳⢺⢻⢤⢥⢬⢭⢦⢧⢮⢯⢴⢵⢼⢽⢶⢷⢾⢿⎥⎪🮋▉⎪╭──╮⟬⟭╔╗
+⎣⣀⣁⣈⣉⣂⣃⣊⣋⣐⣑⣘⣙⣒⣓⣚⣛⣄⣅⣌⣍⣆⣇⣎⣏⣔⣕⣜⣝⣖⣗⣞⣟⣠⣡⣨⣩⣢⣣⣪⣫⣰⣱⣸⣹⣲⣳⣺⣻⣤⣥⣬⣭⣦⣧⣮⣯⣴⣵⣼⣽⣶⣷⣾⣿⎦⎪██⎪│╭╮│╔═╝║
+ ▔🭶🭷🭸🭹🭺🭻▁ 🭁🭌 🭂🭍 🭃🭎 🭄🭏 🭅🭐 🭆🭑 🭇🬼 🭈🬽 🭉🬾 🭊🬿 🭋🭀 ₀₁₂₃₄₅₆₇₈₉ ⎛ ▁▂▃▄▅▆▇█ ⎞⎪🭨🭪⎪╰╯││║╔═╝
+ ▏🭰🭱🭲🭳🭴🭵▕ 🭒🭝 🭓🭞 🭔🭟 🭕🭠 🭖🭡 🭧🭜 🭢🭗 🭣🭘 🭤🭙 🭥🭚 🭦🭛 ⁰¹²³⁴⁵⁶⁷⁸⁹ ⎝ ▔🮂🮃▀🮄🮅🮆█ ⎠⎩🭪🭨⎭⧒⧑╰╯╚╝❨❩