Extend to a maximum of 256 component types

[mlange-42]

Rework Mask to hold an array of 4 x uint64 to represent 256 bits. Everything else comes into place by itself.

Alternative to #312:

• Filter.Match takes a mask pointer as argument
• Mask is copied when using as a filter (is pointer receiver in Extend to a maximum of 256 component types #312)

Primarily avoids All(ids...) either returning a pointer, or requiring users to store the result (temporarily) to be able to get a pointer to it.

Performance remains unchanged, except that MaskFilter matches are about 3 times slower (i.e. filters with component inclusion and exclusion). Not sure why, as the mask functions used there are as fast as before.

[coveralls]

Pull Request Test Coverage Report for Build 7463696796

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 6823343272:	0.0%
Covered Lines:	3835
Relevant Lines:	3835

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💛 - Coveralls