util: Add coreboot-configurator

A simple GUI to change settings in coreboot's CBFS, via the nvramtool utility.

Test on the StarBook Mk IV running coreboot 4.15 with:
* Ubuntu 20.04
* Ubuntu 21.10
* MX Linux 21
* elementary OS 6
* Manjaro 21

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I491922bf55ed87c2339897099634a38f8d055876
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59256
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

util/coreboot-configurator/src/README.md

@@ -0,0 +1,31 @@
+# Categories ![alt text](images/StarLabs_Logo.png "Star Labs Systems")
+
+CMOS values should be added to [categories.yaml](src/application/categories.yaml].
+
+This allows `coreboot-configurator` to display them in a relavant tab, with a nice
+name and help text. Without this, they will still be visible in the **Raw** tab.
+
+An example entry is below:
+```
+processor:
+  displayName: Processor
+  me_state:
+    displayName: Intel Management Engine
+    type: bool
+    help: Enable or disable the Intel Management Engine
+```
+
+To explain the options:
+```
+**tabgroup**:				<- This is the reference to the tab group
+  displayName: **Hello World**		<- This is the name of the group that the user
+					   will see
+  **setting_1**:			<- This is the value that should match the CMOS
+					   option.
+    displayName: **Hi World**		<- This is the name of the option that the user
+					   will see.
+    type: **bool**			<- Valid type are: bool (checkbox) and enum
+					<- (dropdown).
+    help: **Greet the World**		<- Help text that is displayed when hovering on the
+					   option.
+```