~tardypad/wend

Describe optional argument usage in man page
Expand description in man page
Move global comment part in script man page to description
Add "invalid" in test output for invalid scripts
Error out on parsing a mixed block of notes
Error out on parsing multiple notes for same content

Better warn the user than silently ignoring them
Add note about the content limitation in script man page
Quote the '|' character in script man page
Define each test on separate line
Fix script parsing when missing newline at end of file
Exchange step_cmp actual and expected parameters

More common with assert(expected, actual)
Make test steps comparison output clearer
Link to Pango font description in man page
Remove .wnd extension from script title
Fix usage of basename

Important for following commit
Add documentation of presentation format
Fix meson setup warning about usage of deprecated ExternalProgram.path

WARNING: Project targets '>=1.1' but uses feature deprecated since
'0.55.0': ExternalProgram.path. use ExternalProgram.full_path() instead
Fix meson setup warning about meson.options minimum version required

WARNING: Project does not target a minimum version but uses feature
introduced in '1.1': meson.options file. Use meson_options.txt instead
Standardize .wnd as the recommended extension
Add basic README
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