feat(node-menu): bring custom menu items to the node menu. Closes #48, closes #53, closes #25, closes #161

[rychkog]

Extended version of #159 with docs added and some clean ups

[codecov]

Codecov Report

Merging #170 into develop will decrease coverage by 0.01%.
The diff coverage is 89.65%.

@@             Coverage Diff             @@
##           develop     #170      +/-   ##
===========================================
- Coverage    95.86%   95.84%   -0.02%     
===========================================
  Files           22       22              
  Lines          798      819      +21     
  Branches       117      120       +3     
===========================================
+ Hits           765      785      +20     
- Misses          14       16       +2     
+ Partials        19       18       -1

Impacted Files	Coverage Δ
src/tree.types.ts	100% <ø> (ø)	⬆️
src/tree.events.ts	89.18% <100%> (+1.31%)	⬆️
src/tree.service.ts	100% <100%> (+3.17%)	⬆️
src/menu/node-menu.component.ts	100% <100%> (ø)	⬆️
src/menu/menu.events.ts	100% <100%> (ø)	⬆️
src/tree.ts	93.11% <100%> (+0.12%)	⬆️
src/tree-internal.component.ts	93.27% <75%> (-1.51%)	⬇️
src/tree.component.ts	90.19% <75%> (-1.48%)	⬇️

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