Search improves

[Nagyjano]

Added features:

• min length for input to start search (default is set to 1)
• expand of nodes on search or not (default is set to true)
• if expand on search how many matched nodes should expand. (default is set to Infinity)

All changes with the default settings do not alter the component former behaviour

[codecov]

Codecov Report

Merging #386 into master will decrease coverage by 0.27%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #386      +/-   ##
==========================================
- Coverage   97.68%   97.41%   -0.28%     
==========================================
  Files          27       27              
  Lines        1037     1044       +7     
  Branches      104      104              
==========================================
+ Hits         1013     1017       +4     
- Misses          9       12       +3     
  Partials       15       15              

Impacted Files	Coverage Δ
src/mixins/treeselectMixin.js	99.42% <66.66%> (-0.58%)	⬇️

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