replace deprecated dependency configurations

Using api and implementation instead of the
deprecated compile configuration.

Update to Gradle 6.0.

performanceDb/build.gradle

@@ -1,11 +1,12 @@
 
 dependencies {
-	compile project(':pdb-api')
-	compile project(':data-store')
-	compile project(':file-utils')
-	compile lib_jackson_databind
-	compile lib_commons_collections4
+	api project(':pdb-api')
+	api project(':data-store')
+	implementation project(':file-utils')
+	implementation lib_jackson_databind
+	implementation lib_commons_collections4
 	
-	compile lib_log4j2_core
-	compile lib_log4j2_slf4j_impl
+	implementation lib_log4j2_core
+	implementation lib_log4j2_slf4j_impl
+  testImplementation project(':pdb-utils')
 }