Feature: constants in HEX block

[MiranDMC]

Please add support of constants in HEX blocks, like:

const foo = 12

hex
    00 11 foo 33 foo
end

Use like that would always insert 4 bytes if value was integer or float. In case of text constants included should be all its characters (without terminator string)

[x87]

constants are ambiguous. consider this example:

const a = 5 
hex
a
end

5 or 10 (0xA)?

[x87]

See #261

[MiranDMC]

Duplicate of #261