FilterContainer.java:
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This class is a container that keeps either content filters or sort filters organized.
Sort/content filters ({@link FilterItem}s) are organized within {@link FilterGroup}s.
FilterGroup.java:
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This class represents a filter category/group. For example 'Sort order'.
Its main purpose is to host a bunch of {@link FilterItem}s that belong to that
group. Eg. 'Relevance', 'Views', 'Rating'
FilterItem.java:
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This class represents a single filter option.
*More in detail:*
For example youtube offers the filter group 'Sort order'. This group
consists of filter options like 'Relevance', 'Views', 'Rating' etc.
-> for each filter option a FilterItem has to be created.
BaseSearchFilters.java:
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The base class for every service describing their {@link FilterItem}s,
{@link FilterGroup}s, the relation between content filters and sort filters.
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