Improvements from trying to use audio analyser

[rewbs]

• Remove requirement to have all values defined on first and last frame.
• Analyser: Show cursor time and frame position.
• Analyser: Allow custom info labels for generated keyframes
• Parseq lang: New functions info_match(regexstr), info_last_match(regexstr) and info_match_count(regexstr). Use these to check for / count patterns in keyframe info labels. More documentation and examples soon.
• Parseq lang: expose prev_computed_value as variable so you can define formulae that depend on the previous fame's value (doc & examples soon)
• Add support for parseq evaluation in prompt (doc & examples soon).
• Fix default scale value, not sure why it was 20
• Add new hybrid comp params these won't work in deforum until https://github.com/deforum-art/deforum-for-automatic1111-webui/pull/213 is merged.
• Misc UI tweaks

[github-actions[bot]]

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