replace deprecated dependency configurations

Using api and implementation instead of the
deprecated compile configuration.

Update to Gradle 6.0.

pdb-plotting/build.gradle

@@ -1,7 +1,12 @@
 
 dependencies {
-	compile project(':performanceDb')
-	compile lib_primitive_collections
-	compile lib_jackson_databind
+	implementation project(':performanceDb')
+	implementation project(':file-utils')
+  implementation project(':pdb-utils')
+	implementation lib_primitive_collections
+	implementation lib_jackson_databind
+	
+  implementation lib_log4j2_core
+  implementation lib_log4j2_slf4j_impl
 }