[Feat] [Issue-185] do not use global variables for all wire.Value expressions

[ProgrammingMuffin]

Fixes Issue-185

Previously, wire used to generate global variables and inject them in place of wire.Value(..) but now it won't create global variables at all and instead puts the value directly from source.

Source:

Generated:

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[ProgrammingMuffin]

testdata/VarValue fails due to program output related problems.

This might be that one edge case where the replaced value is wrong.

[ProgrammingMuffin]

@zombiezen could you please take a look at this PR? Thank you