Theme system extended

[darrenburns]

Extends the capability of the theme system to allow themes like:

name: aurora

primary: '#4a90e2'
secondary: '#50e3c2'
accent: '#b8e986'
background: '#1c2331'
surface: '#2c3e50'
error: '#e74c3c'
warning: '#f39c12'
success: '#2ecc71'
panel: '#34495e'

text_area:
  cursor: 'reverse'
  selection: 'reverse'
url:
  base: 'italic #50e3c2'
  protocol: 'bold #b8e986'
syntax:
  json_key: '#4a90e2'
  json_number: '#50e3c2'
  json_string: '#b8e986'
  json_boolean: '#b8e986'
  json_null: '#b8e986'

author: Darren Burns
description: An example theme.
homepage: https://github.com/darrenburns/posting

[github-actions]

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
src/posting
highlighters.py					51
themes.py
src/posting/widgets
input.py					33, 74
select.py
text_area.py
variable_input.py
src/posting/widgets/request
method_selection.py
request_body.py
url_bar.py
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