Added gradle and cmake project

*** 189,199 ****
   * such as with mouse messages.
   */
  #define LO_INT(l)           ((int)(short)(l))
  #define HI_INT(l)           ((int)(short)(((DWORD)(l) >> 16) & 0xFFFF))
  
! extern JavaVM *jvm;
  
  // Platform encoding is Unicode (UTF-16), re-define JNU_ functions
  // to proper JNI functions.
  #define JNU_NewStringPlatform(env, x) env->NewString(reinterpret_cast<const jchar*>(x), static_cast<jsize>(_tcslen(x)))
  #define JNU_GetStringPlatformChars(env, x, y) reinterpret_cast<LPCWSTR>(env->GetStringChars(x, y))
--- 189,199 ----
   * such as with mouse messages.
   */
  #define LO_INT(l)           ((int)(short)(l))
  #define HI_INT(l)           ((int)(short)(((DWORD)(l) >> 16) & 0xFFFF))
  
! extern "C" JavaVM *jvm;
  
  // Platform encoding is Unicode (UTF-16), re-define JNU_ functions
  // to proper JNI functions.
  #define JNU_NewStringPlatform(env, x) env->NewString(reinterpret_cast<const jchar*>(x), static_cast<jsize>(_tcslen(x)))
  #define JNU_GetStringPlatformChars(env, x, y) reinterpret_cast<LPCWSTR>(env->GetStringChars(x, y))