Encoding detection errors

[jpcima]

I think, the encoding detection issues are vastly resolved, but I'll drop here some samples which are still failing.

z2ow.mid.gz CP932

[jpcima]

random set of some vgmusic's which misdetect:

beachcave.mid.gz
ff1flcst.mid.gz
Mi%27Ihen_Highway.mid.gz
realemotion1.mid.gz
so2_hurry.mid.gz

[jpcima]

goemon.mid.gz

[jpcima]

Idea of algorithm for new heuristic

Let S be an input string of length N
Score ← 0
Counter ← 0
Script ← None
For each codepoint C of S:
    PreviousScript ← Script
    Script ← uscript_getScript(C)
    If Script ≠ PreviousScript:
        Counter ← 0
    Counter ← Counter + 1
    Score ← Score + Counter
Score ← Score / N