Visual D 0.49.0-beta1

Changes:

• installation
  • prepare for VS2019: detect installation, build against VS 2019 SDK, Win SDK 10.0.17763.0
  • bugzilla 19690: installer fails to register MSBuild extensions for Visual Studio Build Tools
• build system
  • now parallel compilation supported by VC projects (thanks to Igor Cesi)
  • bugzilla 19558: now saves all files with single file compile (and run/debug/disassemble)
  • add support for recently added command line options -mixin
  • new "Language" configuration page for -betterC, -dipNN and -transition=/-preview=/-revert= options
  • visualdproj: remove support for D1 and ancient/removed options -nofloat and -property
  • visualdproj: replaced -noboundscheck option with -boundscheck=...
  • bugzilla 19558: save all files with compile and run/debug/disassemble
  • fix reading options from vcxproj with compile and run/debug/disassemble
  • bugzilla 19726: VC project using LDC now adds C runtime to linker dependencies
• dparser
  • catch up with recent language changes:
    • contract expressions
    • traits can appear everywhere a type can be declared
    • allow @UDA for enumerator values
  • parse __vector and __parameters in IsExpression, evaluate __vector
  • fix parsing character literals with surrogate pairs
  • fix tooltips showing storage classes as type constructors
• debugger
  • bugzilla 18889: do not forward tooltip to debugger if hovering compile time identifier (type/enum)
• editor
  • tweaked default colors to better work with dark mode (restart VS and Visual D twice after switch
    between light and dark modes)