O365/csom Enable choosing default library/list experience

[O365Tycho]

Add support to set/choose the list/library experience in O365.
It looks like it's just activating/deactivating a new feature:
https://support.office.com/en-us/article/Switch-the-default-experience-for-lists-or-document-libraries-
from-new-or-classic-66dac24b-4177-4775-bf50-3d267318caa9

Didn't see it as a buildinfeatureid in 1.2.75b yet.

[SubPointSupport]

Just use a hardcoded GUID, will add this one into buildinfeatureid class.

[SubPointSupport]

Done. Added the following:

public static class BuiltInSiteFeatures {

/// <summary>
        /// This Feature enables default experience for lists or document libraries from new or classic on the site.
        /// https://support.office.com/en-us/article/Switch-the-default-experience-for-lists-or-document-libraries-from-new-or-classic-66dac24b-4177-4775-bf50-3d267318caa9?ui=en-US&rs=en-US&ad=US
        /// </summary>
        public static FeatureDefinition EnableDefaultListLibrarExperience = new FeatureDefinition
        {
            Title = "EnableDefaultListLibrarExperience",
            Id = new Guid("{E3540C7D-6BEA-403C-A224-1A12EAFEE4C4}"),
            Scope = FeatureDefinitionScope.Site,
            ForceActivate = false,
            Enable = false
        };
}

and the web one:

public static class BuiltInWebFeatures {

/// <summary>
        /// This Feature enables default experience for lists or document libraries from new or classic on the web.
        /// https://support.office.com/en-us/article/Switch-the-default-experience-for-lists-or-document-libraries-from-new-or-classic-66dac24b-4177-4775-bf50-3d267318caa9?ui=en-US&rs=en-US&ad=US
        /// </summary>
        public static FeatureDefinition EnableDefaultListLibrarExperience = new FeatureDefinition
        {
            Title = "EnableDefaultListLibrarExperience",
            Id = new Guid("{52E14B6F-B1BB-4969-B89B-C4FAA56745EF}"),
            Scope = FeatureDefinitionScope.Web,
            ForceActivate = false,
            Enable = false
        };