Support different notations for library versions

[TomasRiker]

When requesting to load a specific library version, ReLinker currently expects the filename to be like libname.so.<VERSION>. I faced some problems when trying to build apps with native libraries that use this notation - something in the Android build toolchain prevents the file from ending up in the generated APK. So it would be nice to support different notations like libname-<VERSION>.so. Being able to specify a regular expression would be great.