Added support for configurable logging on the ESP32 platform. (#10)

Because the ESP-IDF supports [runtime log level control](https://docs.espressif.com/projects/esp-idf/en/v5.5.2/esp32s3/api-reference/system/log.html#log-level-control), SystemK required some tweak to take full advantage of this.

This PR makes the following changes to SystemK:
- On the ESP32 platform, the highest logging level *compiled in* to the app is now controlable by Kconfig, as "SystemK maximum log level".
- [Protocols.c](272618d49d/Protocols/Protocols.c) was refactored, and the `DEBUG_PACKET_[EN/DE]CODE` #defines were renamed to make it clear that they now only apply to the PSoC platform.
- Some decoding warnings in the Test Protocol were downgraded to debug, since they were a nuisance most of the time.

Co-authored-by: Joe Kearney <joe@clubk.club>
Reviewed-on: #10

Kconfig

@@ -35,4 +35,34 @@ menu "KTag SystemK"
         help
             Value of audio volume representing the minimum volume possible for this device.
 
+    config SYSTEMK_LOG_LEVEL
+        int
+        default 0 if SYSTEMK_LOG_LEVEL_NONE
+        default 1 if SYSTEMK_LOG_LEVEL_ERROR
+        default 2 if SYSTEMK_LOG_LEVEL_WARN
+        default 3 if SYSTEMK_LOG_LEVEL_INFO
+        default 4 if SYSTEMK_LOG_LEVEL_DEBUG
+        default 5 if SYSTEMK_LOG_LEVEL_VERBOSE
+
+    choice SYSTEMK_LOG_LEVEL_CHOICE
+        bool "SystemK maximum log level"
+        default SYSTEMK_LOG_LEVEL_VERBOSE
+        help
+            Set the maximum compiled log level for SystemK.
+            Messages at higher levels will be removed at compile time.
+
+        config SYSTEMK_LOG_LEVEL_NONE
+            bool "No output"
+        config SYSTEMK_LOG_LEVEL_ERROR
+            bool "Error"
+        config SYSTEMK_LOG_LEVEL_WARN
+            bool "Warning"
+        config SYSTEMK_LOG_LEVEL_INFO
+            bool "Info"
+        config SYSTEMK_LOG_LEVEL_DEBUG
+            bool "Debug"
+        config SYSTEMK_LOG_LEVEL_VERBOSE
+            bool "Verbose"
+    endchoice
+
 endmenu