Slow trailing steps fix. Added more defaults.

- Fixed an issue (hopefully) with slow trailing steps after a
triangular velocity profile move. Sets the trapezoid tick cycle counter
to the correct value for an accurate reproduction of the deceleration
curve. Keeps it from arriving too early to the target position, which
causes the slow trailing steps.

- Added Zen Toolworks 7x7 to default settings.

- Updated readme with new edge build.

stepper.c

@@ -263,9 +263,14 @@ ISR(TIMER1_COMPA_vect)
         } else if (st.step_events_completed >= current_block->decelerate_after) {
           // Reset trapezoid tick cycle counter to make sure that the deceleration is performed the
           // same every time. Reset to CYCLES_PER_ACCELERATION_TICK/2 to follow the midpoint rule for
-          // an accurate approximation of the deceleration curve.
+          // an accurate approximation of the deceleration curve. For triangle profiles, down count
+          // from current cycle counter to ensure exact deceleration curve.
           if (st.step_events_completed == current_block-> decelerate_after) {
-            st.trapezoid_tick_cycle_counter = CYCLES_PER_ACCELERATION_TICK/2;
+            if (st.trapezoid_adjusted_rate == current_block->nominal_rate) {
+              st.trapezoid_tick_cycle_counter = CYCLES_PER_ACCELERATION_TICK/2; // Trapezoid profile
+            } else {  
+              st.trapezoid_tick_cycle_counter = CYCLES_PER_ACCELERATION_TICK-st.trapezoid_tick_cycle_counter; // Triangle profile
+            }
           } else {
             // Iterate cycle counter and check if speeds need to be reduced.
             if ( iterate_trapezoid_cycle_counter() ) {