FX.93 CadCraft: MTEXT editor with font, size, bold, italic, underline, colour, alignment

The paragraph text box (MTEXT, TEXTEDIT, a double-click on text) is now a formatted editor: font list, size (the selection, or all of it with nothing selected), B / I / U / strike, colour, left / centre / right, degree, plus-minus and diameter signs, Ctrl+Enter to finish. It writes the MTEXT codes (mt) and the plain text (s), so find, snap, DXF and DWG keep working; text left unchanged keeps its own codes untouched; paste is text only. Files: mtext-edit.js, cadcraft.js (editText), commands.js, cadcraft.css. The command line's height (suggestion 1083, SU.1083) is the third point of the email: the handle on its top edge, or COMMANDLINE, or one line plus F2. Tests: bin/test-cadcraft.mjs; tools/cadcraft-test/browser-textstyle.mjs (headless Chromium).