* testing turtle prefix names where reference starts with number

* remove case insensitive flag from Turtle lexer

* use same end-of-string regex as in SPARQL and ShExC

* make example.ttl valid turtle

* MySQL: Tokenize quoted schema object names, and escape characters, uniquely

Changes in this patch:

* Name.Quoted and Name.Quoted.Escape are introduced as non-standard tokens
* HTML and LaTeX formatters were confirmed to provide default formatting
  if they encounter these two non-standard tokens. They also add style
  classes based on the token name, like "n-Quoted" (HTML) or "nQuoted"
  (LaTeX) so that users can add custom styles for these.
* Removed "\`" and "\\" as schema object name escapes. These are relics
  of the previous regular expression for backtick-quoted names and are
  not treated as escape sequences. The behavior was confirmed in the
  MySQL documentation as well as by running queries in MySQL Workbench.
* Prevent "123abc" from being treated as an integer followed by a schema
  object name. MySQL allows leading numbers in schema object names as long
  as 0-9 are not the only characters in the schema object name.
* Add ~10 more unit tests to validate behavior.

Closes #1551

* Remove an end-of-line regex match that triggered a lint warning

Also, add tests that confirm correct behavior. No tests failed before
or after removing the '$' match in the regex, but now regexlint isn't
complaining.

Removing the '$' matching probably depends on the fact that Pygments
adds a newline at the end of the input text, so there is always something
after a bare integer literal.

fixes #1548

Remove support for single-quoted strings.

Update fennelview example to latest version of library.

* Overhaul the MySQL lexer

Fixes #975, #1063, #1453

Changes include:

Documentation
-------------

* Note in the lexer docstring that Oracle MySQL is the target syntax.
  MariaDB syntax is not a target (though there is significant overlap).

Unit tests
----------

* Add 140 unit tests for MySQL.

Literals
--------

* Hexadecimal/binary/date/time/timestamp literals are supported.
* Integer mantissas are supported for scientific notation.
* In-string escapes are now tokenized properly.
* Support the "unknown" constant.

Comments
--------

* Optimizer hints are now supported, and keywords are
  recognized and tokenized as preprocessor instructions.
* Remove nested multi-line comment support, which is no
  longer supported in MySQL.

Variables
---------

* Support the '@' prefix for variable names.
* Lift restrictions on characters in unquoted variable names.
  (MySQL does not impose a restriction on lead characters.)
* Support single/double/backtick-quoted variable names, including escapes.
* Support the '@@' prefix for system variable names.
* Support '?' as a variable so people can demonstrate prepared statements.

Keywords
--------

* Keyword / data type / function are now in a separate, auto-updating file.
* Support 25 additional data types (including spatial and JSON types).
* Support 460 additional MySQL keywords.
* Support 372 MySQL functions.
  Explicit function support resolves a bug that causes non-function
  items to be treated as functions simply because they have a trailing
  opening parenthesis.
* Support exceptions for the 'SET' keyword, which is both a datatype and
  a keyword depending on context.

Schema object names
-------------------

* Support Unicode in MySQL schema object names.
* Support parsing of backtick-quoted schema object name escapes.
  (Escapes do not produce a distinct token type at this time.)

Operators
---------

* Remove non-operator characters from the list of operators.
* Remove non-punctuation characters from the list of punctuation.

* Cleanup items based on feedback

* Remove an unnecessary optional newline lookahead for single-line comments

This lexer is based on the PythonConsoleLexer and provides the ability
to highlight console input and output for PsySH, a developer console and
REPL for PHP. See https://psysh.org.

* add lexer for pointless

* lexer docstring formatting

* added link to languages doc

* update authors

* update version

* added double string

* added upval keyword

* simplify ptls example code

* rename doubleString -> multiString

Including tests and an example.promql file.

* Update for Csound 6.15.0

* Update comment