Hdl-checker

Other changes:

* Added support for LSP hover and definitions
* Dependencies lines and columns were off by 1
* Handling of files requiring recompilation was broken
* Fixed some issues with testing on Windows

* Files are built on demand (top-down) rather than building the whole project (bottom-up)
* Adding Python3 support
* Added as-you-type support (still experimental)
* Bug fixes

Changelog
- Fixed issue 2 -- Reload configuration file in runtime
- Fixed issue 3 -- Add Verilog support
- Fixed issue 24 -- Add auto detection/selection of the compiler/simulator
- Fixed issue 25 -- Project cache should be placed along the build folder
- Fixed issue 21 -- Provide alternative for syntax check of files not found on project file
- Fixed issue 20 -- Add static check for 'work' as a library
- Improved source file parsing speed
- Auto builder flags assignment
- Added VUnit support (VHDL and Verilog)