tmuxr

• Added support for tmux 3.4.

• Fixed that the temporary socket file would be deleted after testing.

• Ensured tests are being skipped when the tmux binary is not found (cf. Section 1.6 of "Writing R Extensions").
• Made tests more robust by giving tmux more time to call external tools.
• Marked all example code with \dontrun{}.
• Added tmux versions 2.9a, 3.1a, and 3.1b to both Travis-CI and R-CMD-check on GitHub Actions.

• Added functions to change the size, layout, and style of sessions, windows, and panes.
• Added many unit tests to ensure package works with tmux version 2.1 and up.
• Replaced system2() calls with processx::run() for improved speed and stability.
• Replaced id with name to identify sessions, windows, and panes.
• Removed all but one dependency, namely {processx}.
• Removed the notion of a prompt and all wait_*() and derivative send_*() functions. This will be part of {rexpect}.
• Improved README and structure of reference.

First release on CRAN.