Add event field for sponsoring restriction

Closes #207

src/main/java/backend/model/event/Event.kt

@@ -16,6 +16,7 @@ class Event : BasicEntity {
     lateinit var city: String
     var isCurrent: Boolean = false
     var isOpenForRegistration: Boolean = false
+    var allowNewSponsoring: Boolean = false
 
     @OneToMany(mappedBy = "event")
     var teams: MutableList<Team> = ArrayList()

src/main/java/backend/model/event/TeamSummaryProjection.kt

@@ -14,4 +14,7 @@ interface TeamSummaryProjection {
 
     @Value("#{target.event.title}")
     fun getEventTitle(): String
+
+    @Value("#{target.event.allowNewSponsoring}")
+    fun getEventAllowNewSponsoring(): Boolean
 }

src/main/java/backend/view/EventView.kt

@@ -30,6 +30,7 @@ class EventView() {
     var isCurrent: Boolean = false
 
     var isOpenForRegistration: Boolean = false
+    var allowNewSponsoring: Boolean = false
 
     @NotNull
     var duration: Int = 36
@@ -43,5 +44,6 @@ class EventView() {
         this.duration = event.duration
         this.isCurrent = event.isCurrent
         this.isOpenForRegistration = event.isOpenForRegistration
+        this.allowNewSponsoring = event.allowNewSponsoring
     }
 }

src/main/resources/db/migration/V201804020058__add_event_allow_new_sponsoring.sql

@@ -0,0 +1,2 @@
+ALTER TABLE event
+  ADD allow_new_sponsoring TINYINT(1) NOT NULL DEFAULT 0