[code-reflection] Integrated: Simplified bld script and added stricter file types

[Gary Frost]

Added file types (separate types for Dirs, BuildDirs, JarFiles, ClassDirs etc)
Jar file creation was incorrectly naming dirs.  (fixed) 
Can now only create classdirs and jar files under build dirs.  


. ./env.bash 
java @bldr/args bld
java @bldr/args hatrun opencl mandel

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Commit messages:
 - Simplified bld script and added stricter file types

Changes: https://git.openjdk.org/babylon/pull/270/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=270&range=00
  Stats: 3517 lines in 5 files changed: 1297 ins; 2090 del; 130 mod
  Patch: https://git.openjdk.org/babylon/pull/270.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/270/head:pull/270

PR: https://git.openjdk.org/babylon/pull/270