fix lv_txt_ut8_size() with 4 byte characters.

Add user pointer to indev driver for state storage between read() calls

Fix dropdown bug

The selected option is tracked correctly when scrolling through the
dropdown list via keyboard

Beta

Tabview spelling fix

Chart draw bug

Correct instances of hadler -> handler

When drawing chart lines/points/columns, execution will stay in loop forever when point count > 255.
The loop counter i was set to uint8_t when it should be the same size as point_cnt, uint16_t.