Added love.keyboard.setTextInput to enable/disable text input events (enabled by default.)

This fixes the issue of receiving an unwanted text input event if a key is used to bring a game's textbox into focus, since textinput events can be triggered after keypress events if the keypress generates text.

src/modules/keyboard/wrap_Keyboard.h

@@ -32,6 +32,8 @@ namespace keyboard
 int w_setKeyRepeat(lua_State *L);
 int w_hasKeyRepeat(lua_State *L);
 int w_isDown(lua_State *L);
+int w_setTextInput(lua_State *L);
+int w_hasTextInput(lua_State *L);
 extern "C" LOVE_EXPORT int luaopen_love_keyboard(lua_State *L);
 
 } // keyboard