bush: fix links to line numbers and syntax highlighting

[oliver-sanders]

• When a line number is specified in the URL the line will be highlighted on page load.
• Selecting a line no longer requires a content reload.
• Highlighting of logger level information (i.e. INFO, DEBUG, ...) is now restored (broken by the new logging system).

@matthewrmshin please assign second review when the time comes.

[matthewrmshin]

./t/rose-suite-restart/02-basic.t test failure most likely caused by cylc/cylc-flow#2437.

[matthewrmshin]

./t/rose-bush/00-basic.t failure caused by server returning 500. Server err file gives:

  File "/home/matt/rose.git/lib/html/template/rose-bush/view.html", line 68, in template
    'replace', 'CRITICAL', '<span class="nocode text-dander">CRITICAL</span>') | map(
TemplateAssertionError: no filter named 'map'

[oliver-sanders]

./t/rose-bush/00-basic.t now passing!

[oliver-sanders]

Note that https://github.com/oliver-sanders/rose/pull/5/files#diff-cb9830bbb3b655703396b58b67a92e6b adds javascript syntax checking to the test battery for sphinx/_static this could be expanded to lib/html/static/js as well.

[matthewrmshin]

@arjclark do you mind giving this one a quick sanity check?

[arjclark]

Looks suitably sane to me. Assume we're ignoring the codacy bot comments as spurious?

[matthewrmshin]

@arjclark You know what I'd normally say about CamelCase! (OK, I do accept that we should update our JavaScript code to the standard practice, rightly or wrongly, but that should not be the concern of this PR.)