Some discussion on dub dependency resolution

[Hipreme]

Recently, I've added some default timers to my build system, and 
I've noticed something quite interesting:

```
G:\HipremeEngine\tools\user\build_selector\D\ldc2-1.33.0-beta1-windows-x64\bin\dub.exe build --parallel --compiler=dmd -c script
      Warning
      Warning ## Warning for package hipreme_engine ##
      Warning
      Warning The following compiler flags have been specified in 
the package description
      Warning file. They are handled by DUB and direct use in 
packages is discouraged.
      Warning Alternatively, you can set the DFLAGS environment 
variable to pass custom flags
      Warning to the compiler, or use one of the suggestions below:
      Warning
      Warning debugMode: Call DUB with --build=debug
      Warning debugInfo: Call DUB with --build=debug
      Warning warnings: Use "buildRequirements" to control the 
warning level
      Warning
     Starting Performing "debug" build using dmd for x86_64.
   Up-to-date audio-formats 2.1.2: target for configuration 
[boost] is up to date.
   Up-to-date util ~master: target for configuration [library] is 
up to date.
   Up-to-date hipengine_api ~master: target for configuration 
[hipengine] is up to date.
   Up-to-date audio_decoding ~master: target for configuration 
[audioformats] is up to date.
   Up-to-date bindbc-loader 1.0.3: target for configuration [noBC] 
is up to date.
   Up-to-date bindbc-openal 1.0.1: target for configuration 
[dynamic] is up to date.
   Up-to-date directx-d ~master: target for configuration 
[library] is up to date.
   Up-to-date config ~master: target for configuration [default] 
is up to date.
   Up-to-date debugging ~master: target for configuration 
[default] is up to date.
   Up-to-date console ~master: target for configuration [default] 
is up to date.
   Up-to-date error ~master: target for configuration [default] is 
up to date.
   Up-to-date math ~master: target for configuration [default] is 
up to date.
   Up-to-date audio ~master: target for configuration [default] is 
up to date.
   Up-to-date data ~master: target for configuration [default] is 
up to date.
   Up-to-date bind ~master: target for configuration [default] is 
up to date.
   Up-to-date filesystem ~master: target for configuration 
[default] is up to date.
   Up-to-date arsd-official:ttf 10.9.10: target for configuration 
[library] is up to date.
   Up-to-date arsd-official:color_base 10.9.10: target for 
configuration [library] is up to date.
   Up-to-date arsd-official:bmp 10.9.10: target for configuration 
[library] is up to date.
   Up-to-date arsd-official:imageresize 10.9.10: target for 
configuration [library] is up to date.
   Up-to-date arsd-official:jpeg 10.9.10: target for configuration 
[library] is up to date.
   Up-to-date arsd-official:png 10.9.10: target for configuration 
[library] is up to date.
   Up-to-date arsd-official:svg 10.9.10: target for configuration 
[library] is up to date.
   Up-to-date arsd-official:image_files 10.9.10: target for 
configuration [library] is up to date.
   Up-to-date image ~master: target for configuration [arsd] is up 
to date.
   Up-to-date bindbc-opengl 1.0.5: target for configuration 
[dynamic] is up to date.
   Up-to-date windowing ~master: target for configuration 
[default] is up to date.
   Up-to-date renderer ~master: target for configuration [default] 
is up to date.
   Up-to-date font ~master: target for configuration [default] is 
up to date.
   Up-to-date assets ~master: target for configuration [default] 
is up to date.
   Up-to-date fswatch 0.6.1: target for configuration [library] is 
up to date.
   Up-to-date timer ~master: target for configuration [default] is 
up to date.
   Up-to-date tween ~master: target for configuration [default] is 
up to date.
   Up-to-date hipreme_engine ~feature/build_refactor: target for 
configuration [script] is up to date.
     Finished To force a rebuild of up-to-date targets, run again 
with --force
1890ms
```


As you can see, it prints 1890 milliseconds took (almost 2 
seconds), for detecting that literally every dependency was up to 
date. My project per se, can take up to 6 seconds on a partial 
rebuild, 1/3 of the time simply looking if it is up to date, I 
believe this could be a lot better and would like some feedback 
from people if anyone wanted to tackle on that since dub is 
essential to majority D development.