scide: Move Document related stuff from scprocess to doc manager

Signed-off-by: Scott Wilson <i@scottwilson.ca>
scide: Add copyright notice

Signed-off-by: Scott Wilson <i@scottwilson.ca>
scide: Clean up Document enable action methods by removing YAML parsing to a separate method

Signed-off-by: Scott Wilson <i@scottwilson.ca>