merge projects file-utils, byte-utils and pdb-utils

It turned out that most projects needed at least
two of the utils projects. file-utils and byte-utils
had only one class. Merging them made sense.

performanceDb/build.gradle

@@ -2,11 +2,10 @@
 dependencies {
 	api project(':pdb-api')
 	api project(':data-store')
-	implementation project(':file-utils')
+  implementation project(':pdb-utils')
 	implementation lib_jackson_databind
 	implementation lib_commons_collections4
 	
 	implementation lib_log4j2_core
 	implementation lib_log4j2_slf4j_impl
-  testImplementation project(':pdb-utils')
 }