Add obs_source_filter as output target

[Copilot]

Enables outputting URL/API data directly to OBS filter properties (e.g., Color Correction's multiply field). Supports dynamic filter control from external sources like Google Sheets.

Changes

Data model

• Added filter_name and filter_setting_name to output_mapping struct with JSON persistence

UI

• Filters enumerated in dropdown as (Type) SourceName -> FilterName
• Added filter setting name input field, enabled when filter selected

Output routing

• New setFilterCallback() applies values via obs_source_get_filter_by_name() and obs_source_update()
• Type detection: boolean strings → bool, 0x prefix → hex int, numeric → int/double, fallback → string
• Helper functions is_filter_output() and parse_filter_output() to detect and parse filter targets

Usage

Output dropdown: (Image) Scoreboard -> Color Correction
Filter Setting Name: multiply
Template: {{output}}
API returns: "0xFFFF0000" → filter updates to red

Supports any OBS filter (built-in or third-party), any property type. See FILTER_OUTPUT_USAGE.md for details.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add obs_source_filter as Output</issue_title> <issue_description>Could it be possible to add obs_source_filter as an Output for URL Source. I use the plugin to pull data from Google sheets to create dynamic overlay for esports events (scoreboard and such) and it would be helpful if I could edit Filter "Color Correction" and it's field "Color Multiply" with the plugin.

I understand if this specific use-case is out of the scope. If it can't be added officially I will compile my own version with support for that specific filter.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes royshil/obs-urlsource#139

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