[PLAT-6048] Add external schemes configuration and make position resources work with combined position master Reviewed-By:Daniel
[PLAT-6048] Fix testcases to create web position resources with external schemes configuration Reviewed-By:Daniel
[PLAT-6048] Configure simulated example server with OG_SYNTHETIC_TICKER external scheme Reviewed-By:Daniel
[PLAT-6048] Use uniqueIdScheme from request to choose position master delegate Reviewed-By:Daniel
[PLAT-6048] Change ftl files to display uniqueIdschemes and external schemes Reviewed-By:Daniel
[PLAT-6147] - Implement hashCode() and equals() for links Reviewed-by: Julian