v0.5.2

• Created bpp-lsp: A Bash++ language server
  This language server has full support for:
  Go-to-definition, hover text, in-editor diagnostics (errors, etc),
  and completions.
  It is multi-threaded and mostly compliant with the LSP spec.
• VSCode Extension: Added support for the language server
  If the language server is installed on your system, then by default,
  the VSCode extension will connect to it. If it is not installed, then
  no error messages will be shown.
• Polished the package's build system
• Error reporting: More helpful error messages in the case of method
  parameters
• Error reporting: Manually track lexer token position data
  This fixes a bug in which occasionally an error would be reported for
  a token, and we would not be able to say where in the file that
  token was.
• Bug fix: Emit special lexer tokens for class definition start and end
  Fixes an elusive bug in which occasionally the parser would not
  recognize a class definition
• Optimization: Abstracted a 'resolve_reference' function for use by
  all 4 object reference rules (rvalue/lvalue, object/self references)