Show current command and its binding

This package provides four modes that display the current command and its key or mouse binding.

• keycast-mode-line-mode shows the current binding at the bottom of the selected window, in its mode line.
• keycast-header-line-mode shows the current binding at the top of the selected window, in its header line.
• keycast-tab-bar-mode shows the current binding at the top of the selected frame, in its tab bar.
• keycast-log-mode displays a list of recent bindings in a dedicated frame.