Change of Project Name and Image Sizing Unit

[0.3.0] - 2022-04-26

Fixed

• [lib] Fixed the scroll parameter of TermImage.draw() (#29).
• [tui] Fixed TUI crashing when "max notifications" config option is set to 0.
• [cli,tui] Fixed handling of some errors in the viewer (#33).

Changed

• Renamed the project, CLI executable, top-level package and user directory (#28)
• [lib] Changed sizing units to columns and lines (#29).
• [lib] Padding width is now validated only when drawing to the terminal (via TermImage.draw()) (#32).
• [cli,tui] Updated the viewer's exit codes (#33).
• [test] Updated and re-organized the test suite (#31).

Deprecated

• [lib] Deprecated top-level package name term_img (#28).

Removed

• [lib] Removed "size too small" check and exception when setting size (#29).