Add theft to project

.gitmodules

+[submodule "external/theft"]
+	path = external/theft
+	url = https://github.com/silentbicycle/theft.git

BUILDS/BUILD.theft

+cc_library(
+    name = "theft",
+    srcs = glob(["src/*.c"]),
+    hdrs = glob(["inc/*.h", "src/*.h"]),
+    copts = ["-Iexternal/theft/inc", "-ltheft"],
+    visibility = ["//visibility:public"],
+)

WORKSPACE.bazel

+new_local_repository(
+    name = "theft",
+    path = "./external/theft",
+    build_file = "BUILDS/BUILD.theft"
+)

theft @ 62e093d9

+Subproject commit 62e093d9e33bb4218736dce2535eedda2904b8ba

tests/BUILD.bazel

 # Needed for each target whose artifacts are to be checked.
 cc_test(
     name = "check",
-    srcs = [":check.cc"],
+    srcs = ["check.cc"],
     args = ["/home"],
-    deps = ["//src:render"]
+    deps = ["//src:render", "@theft//:theft",]
 )

tests/check.cc

 #include "src/canvas.h"
 
+extern "C" {
+#include "external/theft/inc/theft.h"
+}
+
 int main(void) {
+    theft_seed_of_time();
     return say();
 }