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xterm compatibility

Emulation by JetBrains' JediTerm, so vim, htop and less behave: mouse reporting in all four wire formats, application cursor keys, 256 colors and 24-bit color, and double-width characters.

xterm compatibility is a long tail of cursor modes, character sets, scroll regions and a hundred escape sequences, and getting one wrong shows up as a program subtly misbehaving. Termina leaves that to JediTerm, the emulator inside JetBrains’ IDEs, and draws its screen.

• Full-screen programs work. vim, htop, less, man and the rest, on the alternate screen, with bracketed paste and scroll regions.
• Mouse reporting in the four xterm wire formats (X10, UTF-8, URXVT and SGR), chosen by the program, including pointer motion for programs that ask for it. Shift bypasses it. See Selection and the mouse.
• Keys are encoded by the emulator, so Up is ESC O A in application-cursor mode and ESC [ A otherwise, whichever the program asked for. Dead keys, AltGr and input methods work, and Alt can act as Meta for readline’s M-b and M-f (Settings → Terminal → Input).
• Color: the 16 ANSI colors from the theme, the 256-color palette and 24-bit color.
• Double-width characters such as CJK and emoji take two cells, and icons from an installed Nerd Font stay on the grid, so eza --icons columns line up.

Not there yet: inline images, the kitty keyboard protocol, and links declared with OSC 8.