Reset internal state on config save

We now reset registers, frame counter ("time") and accumulated
fractional relative usage values on configuration save.

This should make it easier to test certain configurations without
having to unplug the device every time.

firmware/src/config.cc

@@ -875,7 +875,7 @@ void handle_set_report1(uint8_t report_id, uint8_t const* buffer, uint16_t bufsi
                 case ConfigCommand::RESUME:
                     resume_pending = true;
                     config_updated = true;
-                    // XXX clear input_state, sticky_state, accumulated?
+                    reset_state();
                     break;
                 case ConfigCommand::PAIR_NEW_DEVICE:
                     pair_new_device();

firmware/src/remapper.cc

@@ -1918,6 +1918,13 @@ void print_stats() {
     processing_time = 0;
 }
 
+void reset_state() {
+    memset(registers, 0, sizeof(registers));
+    accumulated.clear();
+    layer_state_mask = 1;
+    frame_counter = 0;
+}
+
 void set_monitor_enabled(bool enabled) {
     if (monitor_enabled != enabled) {
         monitor_input_state.clear();

firmware/src/remapper.h

@@ -37,6 +37,7 @@ void queue_get_feature_report(uint16_t interface, uint8_t report_id, uint8_t len
 void send_out_report();
 bool send_monitor_report(send_report_t do_send_report);
 void print_stats();
+void reset_state();
 
 void set_monitor_enabled(bool enabled);
 void monitor_usage(uint32_t usage, int32_t value, uint8_t hub_port);