Parses and merges snippets from a source file into the .vscode/snippets.code-snippets file.
If the snippets file doesn't exist, it creates a new one.
Returns true if successful, false if there was an error.
Parses and merges tasks from a source file into the .vscode/tasks.json file.
If the tasks.json file doesn't exist, it creates a new one.
Returns true if successful, false if there was an error.