This commit updates the BUILD files to specify fine-grained node_module deps
by replacing "@typings" comments with actual @npm node module.
Moved tools/bazel.rc -> .bazelrc
Removed "jasmine" typings from base tsconfig.json
Added @bazel/karma to devDependencies, needed for `ts_web_test`
This should clean up the code a bit.
Note: at first I added the no-useless-cast rule, but after getting frustrated
with it (as it has many false positive), I decided to remove the rule but some
useless casts were removed so I let those in the PR.
