Support dotnet standard 2.0

[MonkAlex]

Supported now all, without sqlite.

Need for #109 avalonia, has problem with mono perfomance.

Wait sqlite release, its must be faster - https://system.data.sqlite.org/index.html/tktview/5c89cecd1b4ccb384327

[MonkAlex]

Test up, code coverage broken - show only test coverage.

[codecov[bot]]

Codecov Report

Merging #113 into master will decrease coverage by 0.13%. The diff coverage is 74.72%.

@@            Coverage Diff             @@
##           master     #113      +/-   ##
==========================================
- Coverage   76.11%   75.98%   -0.14%     
==========================================
  Files         127      174      +47     
  Lines        3425     6524    +3099     
  Branches      326      499     +173     
==========================================
+ Hits         2607     4957    +2350     
- Misses        671     1342     +671     
- Partials      147      225      +78

Impacted Files	Coverage Δ
Tests/Tests.Entities/Manga/ReadmangaMoved.cs	94.73% <ø> (+0.61%)	:arrow_up:
MangaReader.Core/ISiteParser.cs	100% <ø> (ø)	:arrow_up:
Tests/Tests.Convertation/1.12/Convert.cs	100% <ø> (ø)	:arrow_up:
Tests/Tests.Convertation/1.20/Convert.cs	100% <ø> (ø)	:arrow_up:
MangaReader.Core/ApplicationControl/Client.cs	100% <ø> (+100%)	:arrow_up:
MangaReader.Core/NHibernate/SaveOrUpdateEvent.cs	50% <0%> (ø)	:arrow_up:
MangaReader.Core/Services/Page.cs	44.59% <0%> (+6.59%)	:arrow_up:
MangaReader.Core/Loader.cs	55.1% <0%> (-1.66%)	:arrow_down:
MangaReader.Core/Services/Log.cs	88.23% <0%> (-3.82%)	:arrow_down:
Tests/Tests.Entities/Environment.cs	92.03% <100%> (-1.56%)	:arrow_down:
... and 196 more

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[MonkAlex]

Test coverage work now.

Coverage decrease, its avalonia logic.

[MonkAlex]

Wait 1.0.109.0 now

[MonkAlex]

sqlite lib help with slow work on linux

but, build app for any of platform not work as expected, sqlite libs not attached

[MonkAlex]

Merged to AvaloniaUI.