Release 2.0.0

This new major release includes a number of incompatible
changes. These have been tagged in the changelog.

• [Incompatible, TRLC, LRM, API] New major version as all deprecated
  features have been removed:

  • The deprecated builtin function syntax trlc:foo has been
    removed. You should now use foo instead.

  • Support for check files has been removed. You can simply move any
    checks into the rsl file.

  • API support surrounding check files in the Source_Manager has been
    removed.

• [Incompatible, TRLC, LRM, API] The LRM had rules that names need to
  be sufficiently distinct, for example having Foo, foo or Fo_o
  in the same namespace would not be allowed. This was previously not
  implemented at all.

  The rules have been strengthened to apply to all names (packages,
  types, literals, objects) and are now enforced. This is also a
  backwards incompatible change as it may invalidate some previously
  valid .trlc or .rsl files.

• [TRLC] The --verify command is now supported on Windows without
  the use of an external cvc5 install, now that the Python package
  for CVC5 is also available on Windows.

• [TRLC, LRM] New builtin function oneof. This can be used to test
  if precisely one of a number of parameters is true. For example:

• [TRLC] The warning about late package declarations is no longer
  issued.

• [TRLC] New command-line flag -I which can be used to register
  include directories. You can use this to automatically parse a
  minimal set of file. Normally when invoking eg trlc foo.trlc this
  will fail, because you did not provide e.g. foo.rsl.

  With the -I flag you can now automatically let the tool discover
  any dependencies. When using e.g. trlc -I . foo.trlc the tool will
  discover it also needs foo.rsl and maybe potato.rsl which you
  imported in foo.trlc.

  Especially in large projects this will be much faster than
  explicitly parsing everything.

• [API] The source manager has a new function
  register_include
  which should be used before any register_file or register_dir
  calls.

• [API] When using includes, the symbol table will contains packages
  for every discovered package. These are indistinguisable from normal
  (but empty) packages, so if you're relying on iterating over all
  known packages you will find a lot of unused and empty ones now. If
  the include mechanism is not used, then there is no change in
  behaviour.

• [TRLC] Various performance improvements when parsing large files.

• [TRLC] Add --version flag that can be used to figure out the
  installed TRLC version.

• [TRLC] Fix bug when creating a lexer with an empty file with
  delivered file content. The lexer attempted to open the file instead
  of using the empty string passed to the constructor.

• [TRLC] Fix a bug in the verifier mistranslating existential
  quantifiers. This could both lead to false alarms and missed bugs.

• [TRLC] Fix a bug parsing record references of incorrect types,
  instead of an ICE we now create an error message.