bench51 v0.3.0

Added

• Vim keybindings in the GUI editor, on by default: Normal, Insert, Visual
  and Visual Line modes, motions with counts, operators with text objects,
  registers, undo/redo, . repeat, macros, search with highlighting, and
  :w :q :wq :e :make. A block cursor and a mode line show the state, and
  gd jumps to a label's definition.
• A Settings menu with Keybindings (Vim / Standard) and Theme, and a
  --keymap vim|standard flag.

Changed

• Theme moved from the View menu to Settings.
• The terminal app moved from src/ to crates/bench51-tui (package
  bench51-tui, binary still bench51); the repository root is now a
  plain workspace. From source: cargo install --path crates/bench51-tui.

Fixed

• --theme, --keymap and --clock no longer overwrite the saved
  settings; they only apply to that run.

bench51 v0.2.0

Added

• bench51-gui, a desktop IDE laid out like Keil µVision: menus, toolbar,
  Project window, editor with breakpoint and error gutter, Build Output, and
  in a debug session the Registers, Disassembly, Memory, Symbols, UART #1,
  Ports, Timers and Interrupts windows. Windows dock and tab anywhere; the
  edit and debug layouts are remembered separately.
• Monochrome, dot-matrix design in dark and light themes (follows the
  system by default), with Space Grotesk, Space Mono and Doto bundled.
• µVision's keys (F7, Ctrl-F5, F5, F10/F11, Ctrl-F10/F11, F9) with the
  TUI's as aliases; find (Ctrl-F); inline memory editing; clickable SFR
  bits and port pins; drag-and-drop to open files.
• Prebuilt releases for Linux (x86_64, aarch64), Windows (x86_64) and macOS
  (Apple silicon, Intel), with one-line installers: install.sh for Linux
  and macOS, install.ps1 for Windows.
• CI on Linux, Windows and macOS.

Changed

• The assembler, simulator and debugger session moved into a shared
  bench51-core crate used by both front ends. The terminal app behaves
  as before.
• Unsafe code is forbidden across the workspace.