New scraper and scrape format

[Cortys]

This PR includes the new configurable scraper implementation along with a scrape config for scikit-learn. The scraper can be used via a simple CLI that is documented in lib-scraper/README.md.

The main differences of the new scraper compared to the old one are:

• It is configurable, i.e. it can be applied to any library by writing a simple scrape config for that library (e.g. scikit config).
• It has a language model. The scraper has an extensible language model. This allows it to infer basic facts about scraped information (e. g. that a method called __init__ is a constructor in a python library) and to validate scraped facts against the model.
• It outputs a queryable scrape database instead of a nested JSON file. The scrape database essentially is a triple store and can be queried using Datalog.

I also included a very basic integration of the new scrape format into ida-ws to show that it works. This integration is however only preliminary, it just queries the new scrape database for the same data that was included in the old scrape already. This should be replaced by a more general code generator in the future.

[codecov-io]

Codecov Report

Merging #114 into master will decrease coverage by 2.88%. The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #114      +/-   ##
============================================
- Coverage     23.84%   20.96%   -2.89%     
+ Complexity       99       98       -1     
============================================
  Files            48       54       +6     
  Lines          1279     1436     +157     
  Branches        146      160      +14     
============================================
- Hits            305      301       -4     
- Misses          962     1123     +161     
  Partials         12       12

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/upb/ida/provider/DataDumpProvider.java	100% <100%> (ø)	5 <4> (-4)	:arrow_down:
ida-ws/src/main/java/upb/ida/util/FileUtil.java	34.78% <0%> (-7.81%)	7% <0%> (+1%)
...da-ws/src/main/java/upb/ida/util/DataDumpUtil.java	78.57% <0%> (-7.15%)	4% <0%> (-1%)
...c/main/java/upb/ida/bean/cluster/ClusterParam.java	30.43% <0%> (-4.35%)	3% <0%> (ø)
...ain/java/upb/ida/bean/cluster/ClusterAlgoDesc.java	37.5% <0%> (-4.17%)	3% <0%> (-1%)
.../java/upb/ida/provider/RiveScriptBeanProvider.java	100% <0%> (ø)	3% <0%> (+1%)	:arrow_up:
...s/src/main/java/upb/ida/venndiagram/VENN_ITEM.java	0% <0%> (ø)	0% <0%> (?)
...s/src/main/java/upb/ida/venndiagram/VENN_Util.java	7.14% <0%> (ø)	1% <0%> (?)
.../java/upb/ida/venndiagram/VENN_DATA_GENERATOR.java	0% <0%> (ø)	0% <0%> (?)
.../main/java/upb/ida/provider/GeoDiagramHandler.java	3.44% <0%> (ø)	1% <0%> (?)
... and 2 more

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