Construct from a bin/dec/hex string

[rdaly525]

This would be a cool feature to have

//C style
bit_vector<68>("0xABCDEF01234567890");
bit_vector<8>("0b10110100");

//verilog style
bit_vector<68>("68'hABCDEF01234567890");
bit_vector<8>("8'b1011_0100");
//Note verilog allows '_' as a separator in literals that is ignored.

I dont have strong opinions on which style. Although the ability to have a separator for readability purposes is really nice

[dillonhuff]

It is probably possible to accomodate both styles right? The constructor could just read the whole thing, check which prefix matches and then dispatch the correct call based on that.

If not we could just pick one to use for constructors and then have a constructor function like:

bit_vector<8> a = build_bv<8>("8'b1011_0100");

[dillonhuff]

reminder about this!!!