Apply some modernization (#1)

- Update dependencies
- Inline external repository `BUILD` files
- Add `rules_swift` to `xcbbuildserviceproxykit_dependencies`
- Make it build with Bazel 5.1.1
- Rename `BUILD.bazel` files to `BUILD` where possible
- Use copies of BEP protos instead of depending on Bazel external repository
- Remove SwiftPM support

Signed-off-by: Brentley Jones <github@brentleyjones.com>

Author: brentleyjones

.bazelversion

@@ -1 +1 @@
-3.6.0
+5.1.1

.gitignore

@@ -1,4 +1,3 @@
-.swiftpm/
 /bazel-*
 /Examples/bazel-*
 /.vscode

BUILD.bazel BUILDBUILD.bazel renamed to BUILD

@@ -1 +1 @@
-3.6.0
+5.1.1

Examples/.bazelversion

@@ -0,0 +1,51 @@
+load(
+    "@build_bazel_rules_swift//swift:swift.bzl",
+    "swift_proto_library",
+)
+
+# protos
+proto_library(
+    name = "build_event_stream_proto",
+    srcs = ["build_event_stream.proto"],
+    deps = [
+        ":command_line_proto",
+        ":failure_details_proto",
+        ":invocation_policy_proto",
+        "@com_google_protobuf//:duration_proto",
+        "@com_google_protobuf//:timestamp_proto",
+    ],
+)
+
+proto_library(
+    name = "command_line_proto",
+    srcs = ["command_line.proto"],
+    deps = [
+        ":option_filters_proto",
+    ],
+)
+
+proto_library(
+    name = "failure_details_proto",
+    srcs = ["failure_details.proto"],
+    deps = [
+        "@com_google_protobuf//:descriptor_proto",
+    ],
+)
+
+proto_library(
+    name = "invocation_policy_proto",
+    srcs = ["invocation_policy.proto"],
+)
+
+proto_library(
+    name = "option_filters_proto",
+    srcs = ["option_filters.proto"],
+)
+
+# swift_protobuf
+
+swift_proto_library(
+    name = "BEP",
+    visibility = ["//BazelXCBBuildService:__subpackages__"],
+    deps = [":build_event_stream_proto"],
+)