This commit prepares the frontend code to be consumed by webpack.
It is a hack: In theory, modules should be declaring and importing the
modules they depend on and the globals they expose directly.
However, that requires significant per-module work, which we don't
really want to block moving our toolchain to webpack on.
So we expose the modules by setting window.varName = varName; as
needed in the js files.
This is preparation for enabling an eslint indentation configuration.
90% of these changes are just fixes for indentation errors that have
snuck into the codebase over the years; the others are more
significant reformatting to make eslint happy (that are not otherwise
actually improvements).
The one area that we do not attempt to work on here is the
"switch/case" indentation.
This appends a space when text is inserted at the end of a message
using `compose_ui.insert_syntax_and_focus`. This is definitely what
users expect when using this feature.
Fixes: #8569.
This fixes compose.test_video_link_compose_clicked to just
use a stub for compose_ui.insert_syntax_and_focus.
It also adds direct tests for compose_ui.insert_syntax_and_focus.
Fixes#6362