add some code to enable jadx can decompile apk by file's type, not only by file's extension

Increase heap limit to avoid most OOMs in Gradle

Replace jadx-core/lib/dx-1.10.jar with recent AOSP dx.jar

add translation of Chinese

Also removed the travis test for java 1.6.

Java 1.7 version of dx.jar compiled with plaform/libcore at commit
c3e562a and platform/dalvik at commit db9197b with
https://android-review.googlesource.com/#/c/221127/1 cherry-picked on
top of it.

Recently support has been added to AOSP for generating and running
version 037 dex files. In order to load these we update the dx.jar
with a recent version built from AOSP.

add translation of Chinese

multidex support for apk & zip