Add LanguageModel class

java/res/raw/.gitignore

java/src/org/futo/inputmethod/latin/Dictionary.java

...src/org/futo/inputmethod/latin/DictionaryFacilitator.java

...org/futo/inputmethod/latin/DictionaryFacilitatorImpl.java

java/src/org/futo/inputmethod/latin/LatinIME.kt

java/src/org/futo/inputmethod/latin/NgramContext.java

java/src/org/futo/inputmethod/latin/RichInputConnection.java

java/src/org/futo/inputmethod/latin/xlm/LanguageModel.java

native/jni/jni_common.cpp

native/jni/org_futo_inputmethod_latin_xlm_LanguageModel.cpp

native/jni/org_futo_inputmethod_latin_xlm_LanguageModel.h