Switch everything to platforms

This patch switches the codebase over from using the "cpu"
mechanism to using bazel platforms. See
https://docs.bazel.build/versions/master/platforms.html for some more
information.

Most of the substantial changes are in //tools. Instead of using
`cc_toolchain_suite` rules, we now use regular `toolchain` rules that
are registered in the WORKSPACE. That also means that bazel now uses
the target platform to select the compiler.

All --cpu=* arguments should now be --config=* arguments. For example,
`--cpu=roborio` should now be `--config=roborio`. The CI script and
all documentation has been updated to reflect that.

The remainder of the changes revolve around tagging all targets with
`target_compatible_with`.  The old mechanism allowed us to specify
repo-wide defaults. The new mechanism does not. That means every
target that didn't have any compatibility specified, now requires
compatibility with `@platforms//os:linux`.

I used buildozer for the vast majority of `target_compatible_with`
changes. buildozer automatically buildifies any BUILD files it
touches. That means this patch also contains a few non-functional
changes that I was too lazy to remove.

Change-Id: I66d6e6ad9161520ee397597cdb492585820a3acd
diff --git a/motors/deploy_joystick.sh b/motors/deploy_joystick.sh
index db0d855..b5af72e 100755
--- a/motors/deploy_joystick.sh
+++ b/motors/deploy_joystick.sh
@@ -1,4 +1,4 @@
 #!/bin/bash
 # Deploy to the driver station side of the pistol grip.
 
-bazel build --cpu=cortex-m4f -c opt //motors/pistol_grip:drivers_station.hex && bazel run //motors/teensy_loader_cli -- --mcu=mk64fx512 -s $(readlink -f bazel-bin/motors/pistol_grip/drivers_station.hex)
+bazel build --config=cortex-m4f -c opt //motors/pistol_grip:drivers_station.hex && bazel run //motors/teensy_loader_cli -- --mcu=mk64fx512 -s $(readlink -f bazel-bin/motors/pistol_grip/drivers_station.hex)