Fortls

Fixed

- Add support for named "SELECT" statements, fixes [80](https://github.com/hansec/fortran-language-server/issues/80)
- Track scopes for "ASSIGNMENT" and "OPERATOR" interface statements, fixes [79](https://github.com/hansec/fortran-language-server/issues/79)
- Fix bug in parsing "SELECT" statements with no space, fixes [77](https://github.com/hansec/fortran-language-server/issues/77)
- Further improve discrimination between end statements and other items, ref [73](https://github.com/hansec/fortran-language-server/issues/73)

Fixed

- Normalize file paths when storing/accessing file index, fixes [75](https://github.com/hansec/fortran-language-server/issues/75)
- Fix intrinsic statement "COUNT" ([76](https://github.com/hansec/fortran-language-server/pull/76))

Fixed

- Further improve discrimination between end statements and variables/block labels, ref [73](https://github.com/hansec/fortran-language-server/issues/73)
- Fix autocomplete errors when ASSOCIATE and ENUM statements are present
- Fix severity reporting with "debug_diagnostics" command line option

Fixed

- Fix discrimination between end statements and variables with underscores, fixes [73](https://github.com/hansec/fortran-language-server/issues/73)
- Detect enum definitions, fixes [74](https://github.com/hansec/fortran-language-server/issues/74)

Fixed

- Detect and support associate statements, fixes [72](https://github.com/hansec/fortran-language-server/issues/72)

Changed

- Add parsing of DO/IF/WHERE blocks and report scope end errors
- Detect and report errors with invalid parent for scope definitions
- Improve highlighting for hover requests in VSCode
- Downgrade missing use warnings to information level
- Add intrinsic declaration statement "double complex" ([70](https://github.com/hansec/fortran-language-server/pull/70))

Fixed

- Fix bug with leading whitespace on visibility statements, fixes [69](https://github.com/hansec/fortran-language-server/issues/69)
- Fix parsing errors when "&" and "!" characters are present inside string literals
- Fix parsing bug with multiple leading function/subroutine modifiers (PURE, ELEMENTAL, etc.)