Added VFS and Single binary build packaging feature

[jeevatkm]

This PR bring features of Virtual FileSystem(VFS) and single binary packaging described in #156.

[codecov]

Codecov Report

Merging #180 into v0-edge will decrease coverage by 0.55%.
The diff coverage is 61.64%.

@@             Coverage Diff             @@
##           v0-edge     #180      +/-   ##
===========================================
- Coverage    79.87%   79.31%   -0.56%     
===========================================
  Files           21       21              
  Lines         2509     2543      +34     
===========================================
+ Hits          2004     2017      +13     
- Misses         353      370      +17     
- Partials       152      156       +4

Impacted Files	Coverage Δ
router.go	70.5% <100%> (ø)	⬆️
config.go	43.1% <100%> (-0.97%)	⬇️
util.go	77.27% <16.66%> (-2.92%)	⬇️
default.go	88.03% <25%> (-4.76%)	⬇️
view.go	84.74% <33.33%> (ø)	⬆️
i18n.go	78.26% <50%> (ø)	⬆️
server.go	63.9% <60%> (-0.44%)	⬇️
static.go	76.92% <70%> (-2.36%)	⬇️
aah.go	63.26% <79.16%> (+0.18%)	⬆️

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