Add more information to GetInfoResponse

[araspitzu]

This PR adds some extra information in the /getinfo API response such as version, color and features, the version string uses a truncated commit and is also used to log the version during boot.

• update documentation

[codecov-io]

Codecov Report

Merging #1344 into master will increase coverage by 0.07%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #1344      +/-   ##
==========================================
+ Coverage   78.05%   78.12%   +0.07%     
==========================================
  Files         146      146              
  Lines       10270    10277       +7     
  Branches      396      412      +16     
==========================================
+ Hits         8016     8029      +13     
+ Misses       2254     2248       -6

Impacted Files	Coverage Δ
...r-core/src/main/scala/fr/acinq/eclair/Eclair.scala	53.53% <0%> (-2.26%)	⬇️
...ir-core/src/main/scala/fr/acinq/eclair/Setup.scala	73.18% <75%> (-0.12%)	⬇️
...in/scala/fr/acinq/eclair/channel/Commitments.scala	90.94% <0%> (+0.34%)	⬆️
...c/main/scala/fr/acinq/eclair/channel/Channel.scala	85.03% <0%> (+0.54%)	⬆️
...src/main/scala/fr/acinq/eclair/router/Router.scala	92.65% <0%> (+0.66%)	⬆️

[t-bast]

LGTM