Allow switches for entry switch instead of only kickers.

[freezy]

This needed some refactoring because initially, colliders wouldn't get the ball entity, which is necessary to destroy it.

Also fixed the trough not being imported correctly because it's not renderable anymore.

TODO

• Check whether we can apply this to all colliders or just keep switches.
• Update documentation

[codecov]

Codecov Report

Merging #248 (72567a0) into master (4bff26c) will increase coverage by 0.17%.
The diff coverage is 85.36%.

@@            Coverage Diff             @@
##           master     #248      +/-   ##
==========================================
+ Coverage   56.59%   56.76%   +0.17%     
==========================================
  Files         159      159              
  Lines        9388     9418      +30     
  Branches      930      932       +2     
==========================================
+ Hits         5313     5346      +33     
+ Misses       3856     3848       -8     
- Partials      219      224       +5     

Impacted Files	Coverage Δ
VisualPinball.Engine/VPT/Table/Table.cs	49.60% <0.00%> (-0.27%)	⬇️
VisualPinball.Engine/VPT/Trough/Trough.cs	81.13% <88.23%> (+19.59%)	⬆️
VisualPinball.Engine/VPT/Trough/TroughData.cs	96.15% <100.00%> (+0.15%)	⬆️
VisualPinball.Engine/VPT/Mappings/Mappings.cs	77.72% <0.00%> (-1.00%)	⬇️
VisualPinball.Engine/IO/BiffData.cs	89.78% <0.00%> (+5.10%)	⬆️

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