Add brsconfigPath launch config to merge brsconfig.json values

[TwitchBronBron]

Summary

Adds a new brsconfigPath property to launch.json that points to a brsconfig.json file. When set, the extension reads files, rootDir, and logLevel from that file and merges them as base values into the launch config — eliminating duplication for standard BrightScript projects that already describe their structure via brsconfig.

brsconfig.json is loaded with the same parser BrighterScript uses for bsconfig.json, so it supports extends inheritance, JSONC (comments and trailing commas), and resolves rootDir relative to the config file.

When brsconfigPath is set, bsconfig.json is not auto-loaded. The two configs are mutually exclusive: brsconfigPath is an explicit opt-in for standard BrightScript projects.

Merge priority (lowest → highest): brsconfig < launch.json.

Why

brsconfig.json is a lightweight project-structure config for standard BrightScript (no compiler), distinct from BrighterScript's bsconfig.json. The BrsConfigProjectProvider already uses brsconfig.json for project discovery (files, rootDir). This PR closes the loop so users writing their own launch.json can reference the same file via brsconfigPath instead of repeating values.

Example

// brsconfig.json
{
  "rootDir": "src",
  "files": ["manifest", "source/**/*.brs", "components/**/*"]
}

// launch.json
{
  "type": "brightscript",
  "request": "launch",
  "name": "BrightScript Debug: Launch",
  "host": "192.168.1.17",
  "password": "rokudev",
  "brsconfigPath": "${workspaceFolder}/brsconfig.json"
  // rootDir, files inherited from brsconfig.json; launch.json wins on conflict
}

Changes

• DebugConfigurationProvider.ts
  • New getBrsConfig(config, workspaceFolder) method — loads via bslangUtil.loadConfigFile (so extends chains and JSONC work), resolves ${workspaceFolder} and relative paths, extracts only the three supported properties, throws a clear error if the referenced file is missing or invalid
  • sanitizeConfiguration now selects brsconfig OR bsconfig (not both) based on whether brsconfigPath is set
  • New brsconfigPath?: string on the BrightScriptLaunchConfiguration interface
• package.json — adds the brsconfigPath property to the launch config schema
• docs/Editing/index.md — restructured to lead with brsconfig.json for standard BrightScript projects; bsconfig now a brief follow-on for BrighterScript users
• docs/Debugging/index.md — new section on brsconfigPath cross-linked from the Editing doc

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