See #4872.

ES5, breaking up of whitespace tokens

Add template/variable definitions, checking, types, additional
keywords and indentation fixes.

 - Added for as a defining keyword
 - Added new types and operators
 - Fixed numbers so basic integers are represented
 - Identifiers can now be surrounded with backticks
 - Properties and #/@ instructions are now distinct, with the latter represented as a builtin type
 - Properties are now matched before punctuation. Code can now fold.
 - Remove the regexp checking as that syntax does not currently exist in Swift
 - Added tests

@ as __matmul__ operator only on Python 3,

Add tests for Python mode for this use case.

Closes #3957

There were two issues:

1. Github flavored markdown calls Objective C `objective-c`
2. The gfm.js mode didn't include `-` in its fenced code block regex

Additionally, test/index.html did not import the mode/meta.js file,
which prevented mode lookup by name from working in unit tests.

Added tests and fixed some issues uncovered by testing.

 * Support nested block comments.
 * Improve number and operator parsing.
 * Improve string parsing.
 * Style brackets correctly.
 * Improve #-words.

Closes #3742
Closes #3744

Closes #3245

Closes #3470

And a few minimal tests for the mode

Add tests. Adjust addons that depended on previous token structure.

Also improve indentation around implicit end tags in HTML.

Issue #2176
Issue #2333

relates to https://github.com/marijnh/CodeMirror/issues/314

relates to https://github.com/marijnh/CodeMirror/issues/314

Issue #778

And add a test suite.

Issue #2009