The OLED configuration variables
can be used to easily customize the display:
oled_horizontal - Horizontal or vertical orientation
graph_direction - Graph movement direction
graph_refresh - Frequency of graph lines
graph_top_wpm - WPM required to reach the top of the graph
icon_med_wpm - WPM required to display the medium snail
icon_fast_wpm - WPM required to display the fast snail
MA_LAYER_NAME - Layer 0 display name
L1_LAYER_NAME - Layer 1 display name
L2_LAYER_NAME - Layer 2 display name
L3_LAYER_NAME - Layer 3 display name