Display tuning

added config settings for display tuning

config/config.json

@@ -6,10 +6,30 @@
         "country": "US"
     },
     "display": {
-        "brightness": 50,
-        "rows": 32,
-        "cols": 64,
-        "chain_length": 2,
+        "hardware": {
+            "rows": 32,
+            "cols": 64,
+            "chain_length": 2,
+            "parallel": 1,
+            "brightness": 50,
+            "hardware_mapping": "adafruit-hat-pwm",
+            "scan_mode": "progressive",
+            "pwm_bits": 11,
+            "pwm_dither_bits": 0,
+            "pwm_lsb_nanoseconds": 130,
+            "led_rgb_sequence": "RGB",
+            "pixel_mapper_config": "U-mapper",
+            "panel_type": "",
+            "row_addr_type": 0,
+            "multiplexing": 0,
+            "disable_hardware_pulsing": false,
+            "inverse_colors": false,
+            "show_refresh_rate": false,
+            "limit_refresh_rate_hz": 100
+        },
+        "runtime": {
+            "gpio_slowdown": 3
+        },
         "rotation_interval": 10
     },
     "clock": {