scouting: Deduplicate action definitions in entry.component.ts

I found it tedious to keep the definitions up-to-date between the .fbs
file and the entry.component.ts file. This patch fixes the issue by
using the generated flatbuffer types everywhere.

I added a helper library to deal with `actionTakenType` properly.
Otherwise the user would have to deal with it manually.

Since Angular templates don't seem to allow manual type casting, I
created a pipe to do it for me.

Signed-off-by: Philipp Schrader <philipp.schrader@gmail.com>
Change-Id: I5f60e2d7b89978f40b5758bb8d04e800d6de230d
diff --git a/scouting/www/pipes/public-api.ts b/scouting/www/pipes/public-api.ts
new file mode 100644
index 0000000..77a5641
--- /dev/null
+++ b/scouting/www/pipes/public-api.ts
@@ -0,0 +1 @@
+export * from './pipes.module';