Migration for MCP 2.0 on upgrade to 2.10

- Presentation XSL file names for MCP 2.0 changed in accordance with MCP 1.4 standards
- Cherry-picked MCP 2.0 changes from core schema-plugins repo from the point at which version 2.0 was introduced
- Modified index-fields.xsl transformation for mcp 2.0 in accordance with current mcp 1.4 standards and added missing schematron rules

Changes were tested by adding mcp 2.0 schemas in local geonetwork 2.10 instance, as well as testing changed XSL files on an example metadata record in XML format (argo)