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.

data-store/build.gradle

@@ -2,10 +2,8 @@ apply plugin: 'antlr'
 
 dependencies {
 	implementation project(':pdb-api')
-	implementation project(':file-utils')
 	implementation project(':pdb-utils')
 	api project(':block-storage')
-	implementation project(':byte-utils')
 	antlr lib_antlr
 	
 	implementation lib_primitive_collections