Support strikethrough

[zamicol]

Probably as an extra mode. Look at U+0336, "long stroke overlay". Example base85:

0̶1̶2̶3̶4̶5̶6̶7̶8̶9̶A̶B̶C̶D̶E̶F̶G̶H̶I̶J̶K̶L̶M̶N̶O̶P̶Q̶R̶S̶T̶U̶V̶W̶X̶Y̶Z̶a̶b̶c̶d̶e̶f̶g̶h̶i̶j̶k̶l̶m̶n̶o̶p̶q̶r̶s̶t̶u̶v̶w̶x̶y̶z̶!̶#̶$̶%̶&̶(̶)̶*̶+̶-̶;̶<̶=̶>̶?̶@̶^̶_̶`̶{̶|̶}̶~̶