Made meta-bug tree optional,

post v0.4.0:
- Add crash-stat API Token to perform queries to find similar
crashes when signatures are listed in a Bug description. This
would be useful in case a similar bug has already been fixed, or
in case one is already filed.

- Replace usage of insertAdjacentHTML by insertAdjacentElement, to
avoid bugs where some attributes are not properly serialized.

- Use Bugzilla API Key as a way to query information from security
issues. The API Key can be set using the "Preferences" tab of the
addons in about:addons.

- Prevent patching text which is directly in an A tag, to avoid
adding links on top of existing links.

- Add support for converting file into searchfox link from crash
report made on treeherder. ([file:hgrev : line + 0x..]) and
([file:hgrev : line])

- Add support for converting compiler file references
into searchfox links. (path:line:col)

- Within comments, converts file paths to searchfox links when
they are located in code section and follow the following format
"at <path>:<line>", which is typically produced by gdb.

v0.4.0.6: (Since v0.4)
- Prevent patching text which is directly in an A tag, to avoid
adding links on top of existing links.

- Add support for converting file into searchfox link from crash
report made on treeherder. ([file:hgrev : line + 0x..])

- Add support for converting compiler file references
into searchfox links. (path:line:col)

- Within comments, converts file paths to searchfox links when
they are located in code section and follow the following format
"at <path>:<line>", which is typically produced by gdb.

v0.4.0.3:
Add support for converting compiler references (path:line:col) into searchfox links.

v0.4.0 +2:
Within comments, converts file paths to searchfox links when they are located in code section and follow the following format "at <path>:<line>", which is typically produced by gdb.

Follow bugzilla updates which otherwise caused failure to highlight the severity field and to display the list of meta-bugs completely.

Version 0.3:
- Fix how severity is extracted from the DOM to match bugzilla update.
- Escape bug summary when generating the meta section, for bug with title containing <> symbols.

Highlight missing triage decisions according to Mozilla policies:
- non-set priority.
- non-set severity.
- badly set severity.

Highlight the blocked field for SpiderMonkey components, which have to transitively block Bug 1729518.