v1.46.0a0 - Terminal dimension detection

Breaking changes

Workspace builder now detects terminal size (#926)

Dimensions used by workspace builder now use shutil.get_terminal_size().

In conjunction with main-pane-height: 67%, for instance, this will render a proportional layout:

session_name: my session
windows:
- window_name: example with percentage
  focus: True
  layout: main-horizontal
  options:
    main-pane-height: 67%
  panes:
  - focus: true
  - pane 

To use old behavior, set TMUXP_DETECT_TERMINAL_SIZE=0 in your terminal
environment and file an issue on the tracker.

by @tony in #926

Full Changelog: v1.45.0...v1.46.0a0