[TIMOB-25448] Android: Update module build tools to compile with Java 7

*Summary:* Currently, the "appc" command line tool builds Titanium Android modules with Java 6 which is obsolete and generates compiler warnings. We should switch to compiling modules with Java 7 which is 100% supported by the Android SDK and is what Google currently recommends. Plus, module developers can take advantage of Java 7's newest language features, such as the Closable try-resouce feature. *Note:* The Android SDK does not fully support Java 8 yet. We can use the JDK 8 or JDK 9 tools, but compile with Java 7 until Google has full support. *How to test:*

Unzip the attached [^java7module.zip] file.

Open the Mac terminal (or Windows command prompt).

In the terminal, "cd" (change directory) to the "./java7Module/android" directory.

In the terminal, enter: appc ti sdk select

You will be prompted to select an SDK version. Enter the newest Titanium version.

In the terminal, enter: appc run -p "android" --build-only

Verify that the build was successful. (Note that compiler errors will occur if compiling with Java 6.)