SXL 1.2

[otterdahl]

The draft version can be viewed here: https://rsmp-nordic.github.io/rsmp_specifications/rsmp_sxl_traffic_lights/1.2

• [x] https://github.com/rsmp-nordic/rsmp_sxl_traffic_lights/pull/165
• [x] #170
• [x] #145 and https://github.com/rsmp-nordic/rsmp_sxl_traffic_lights/issues/110
• [x] https://github.com/rsmp-nordic/rsmp_schema/pull/68
• [x] https://github.com/rsmp-nordic/rsmp_sxl_traffic_lights/issues/111
• [x] https://github.com/rsmp-nordic/rsmp_sxl_traffic_lights/issues/117
• [x] https://github.com/rsmp-nordic/rsmp_sxl_traffic_lights/issues/104
• [x] #171
• [x] JSON examples needs to be updated
• [x] change the link in the changelog to a diff between 1.1 tag and 1.2 tag
• [x] Remove deprecated fields (rsmp_schema, sxl, examples)

[emiltin]

edited the link at in the PR description to point to 1.2