refactor event system.

[ymh199478]

Q	A
Branch?	v2.0(master)
Bug fix?	No
New feature?	No
Deprecations?	No
Internal Changed?	Yes(#177 )
Removed	No
Tests pass?	Yes
Doc pr?	No

Submit redesigned interface to avoid using generics

[codecov-io]

Codecov Report

Merging #262 into master will decrease coverage by 0.1%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master     #262      +/-   ##
==========================================
- Coverage   90.23%   90.13%   -0.11%     
==========================================
  Files          35       36       +1     
  Lines        2397     2403       +6     
==========================================
+ Hits         2163     2166       +3     
- Misses        234      237       +3

Impacted Files	Coverage Δ
...rc/CatLib.Core/CatLib/Events/AfterBootEventArgs.cs	100% <ø> (ø)	⬆️
...tLib.Core/CatLib/Events/StartCompletedEventArgs.cs	100% <ø> (ø)	⬆️
...tLib.Core/CatLib/Events/AfterTerminateEventArgs.cs	100% <ø> (ø)	⬆️
...CatLib.Core/CatLib/Events/InitProviderEventArgs.cs	75% <ø> (ø)	⬆️
src/CatLib.Core/CatLib/Events/BootingEventArgs.cs	100% <ø> (ø)	⬆️
...ib.Core/CatLib/Events/RegisterProviderEventArgs.cs	100% <ø> (ø)	⬆️
...c/CatLib.Core/CatLib/Events/BeforeInitEventArgs.cs	100% <ø> (ø)	⬆️
.../CatLib.Core/CatLib/Events/ApplicationEventArgs.cs	100% <ø> (ø)	⬆️
...rc/CatLib.Core/CatLib/Events/AfterInitEventArgs.cs	100% <ø> (ø)	⬆️
...c/CatLib.Core/CatLib/Events/BeforeBootEventArgs.cs	66.66% <ø> (ø)	⬆️
... and 6 more

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