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/tools/lint/prettier.sh b/tools/lint/prettier.sh
index 0198a71..ef4f5ca 100755
--- a/tools/lint/prettier.sh
+++ b/tools/lint/prettier.sh
@@ -28,6 +28,7 @@
 # TODO(phil): Support more than just //scouting.
 web_files=($(git ls-tree --name-only --full-tree -r @ \
     | grep '^scouting/' \
+    | grep -v '\.jinja2\.' \
     | (grep \
         -e '\.ts$' \
         -e '\.js$' \