Add 'asset' URLConnection; IOUtil uses URLConnection / incr. effeciency; Android ClassLoaderUtil cleanup;

- Add 'asset' URLConnection
  - Please read API doc 'PiggybackURLConnection' and 'AssetURLConnection'

  - Solves generic resource handling where platform locations may differ,
    ie ClassLoader lookup on Android in the 'assets/' subfolder.

  - New Android 'AssetDexClassLoader' uses 'assets/' folder for findResource(..)

  - aapt.signed (our APK ant task)
    - uses 'assets/' folder

    - adds the 'assetsdir' attribute allowing to copy other assets into the APK

- IOUtil uses URLConnection / incr. effeciency
  - using URLConnection on all getResource(..) since URL
    is connected anyways for validation and URLConnection can be used by caller right away

  - String getRelativeOf(URL, String) -> URL getRelativeOf(URL, String)
    - preserves scheme, authority, etc
    - simple parentOf handling, more efficient

  - reusing new 'asset' protocol impl.

- Android ClassLoaderUtil cleanup;
  - Use createClassLoader(..) impl for build-in static jogamp and user APKs,
    which removes code redundancy

Tests: New code path, especially 'assets' are covered by new unit tests, no regressions on Linux.

3 files changed, 9 insertions, 0 deletions

diff --git a/make/resources/assets-test/com/jogamp/common/net/data/AssetURLConnectionTest.txt b/make/resources/assets-test/com/jogamp/common/net/data/AssetURLConnectionTest.txt
new file mode 100644
index 0000000..97d70a7
--- /dev/null
+++ b/make/resources/assets-test/com/jogamp/common/net/data/AssetURLConnectionTest.txt
@@ -0,0 +1,3 @@
+AssetURLConnectionTest Data Testing Relative Location
+
+This file exists for test purposes.
diff --git a/make/resources/assets-test/com/jogamp/common/net/data/RelativeData.txt b/make/resources/assets-test/com/jogamp/common/net/data/RelativeData.txt
new file mode 100644
index 0000000..ecdf371
--- /dev/null
+++ b/make/resources/assets-test/com/jogamp/common/net/data/RelativeData.txt
@@ -0,0 +1,3 @@
+Relative Data To com/jogamp/common/net/data/AssetURLConnectionTest 
+
+This file exists for test purposes.
diff --git a/make/resources/assets-test/gluegen-test/info.txt b/make/resources/assets-test/gluegen-test/info.txt
new file mode 100644
index 0000000..14f7494
--- /dev/null
+++ b/make/resources/assets-test/gluegen-test/info.txt
@@ -0,0 +1,3 @@
+Gluegen Test Asset.
+
+This file exists for test purposes.