Obsolete bootstrap.bash and ./soong wrappers

We can call directly into the blueprint bootstrap.bash using values that
soong_ui has already calculated.

Instead of calling into blueprint.bash, build minibp with microfactory,
and directly run ninja. This allows us to get individual tracing data
from each component.

Test: m -j blueprint_tools
Test: m clean; m -j blueprint_tools
Change-Id: I2239943c9a8a3ad6e1a40fa0dc914421f4b5202c

ui/build/Android.bp

@@ -20,6 +20,7 @@ bootstrap_go_package {
         "soong-ui-tracer",
         "soong-shared",
         "soong-finder",
+        "blueprint-microfactory",
     ],
     srcs: [
         "build.go",