Death to void params

[AMurkin]

Summary

SUMMARY: None

Purpose of change

Based on comment.

Describe the solution

Comment parameters names, remove void casts, rewrite some code.

Describe alternatives you've considered

None.

Testing

It compiles. Both tiles and curses.

Additional context

Did not touch extern "C" block in the src/sdltiles.cpp.
Not sure if */*param*/ is a problem. Github shows it in red in the src/activity_handlers.cpp.

[ZhilkinSerg]

Not sure if */param/ is a problem. Github shows it in red in the src/activity_handlers.cpp.

VS complains about it too (*/ resembles closing of multiline comment, but without opening /*). I think warning can be avoided with additional whitespace after first asterisk (i.e. `* /param/).

[jkraybill]

Yeah this is the error from VS:
warning C4138: '*/' found outside of comment

Would be nice to not have this, but it's not a dealbreaker!