Image support using filesystem

See merge request !27

Changes to API

See merge request !34

Changed endpoints to use /api/ prefix, put back usage of models to not have a big dependency on BL when receiving calls, and changed DTOs to records from classes.

Restaurant, Location, User Service testing

See merge request !33

Add tests

See merge request !35

Remove unnecessary usings

Add tests

Revert "Add tests"

This reverts commit bb0faeaa.

Revert "Remove unnecessary usings"

This reverts commit b710e528.

Revert "Add RestaurantId to ReviewDTO"

This reverts commit 5cfaac14.

IssueEventService, EventCommentService, EventParticipantService Implementation

See merge request !29

Resolve "RestaurantService, LocationService, UserService Implementation"

Closes #28

See merge request !26

ReviewAggregateResult, Review and ReviewComment Services

See merge request !28

Added TestUtilities for database and DI mocking

See merge request !25