Clang static analysis reports these as 'Result of operation is
garbage or undefined' errors.

Clang static analysis reports an 'Assigned value is garbage or
undefined' for this. If no points were read from the file, the
`n_points` variable is 0 and `env_x[n_points-1]` performs an
out-of-bounds access.

Clang static analysis reports an 'Assigned value is garbage or
undefined' error. This happens if the default_tune data has not
been copied in the kTUNE case.

Extending this further, it does not make sense to save the tune
data if the tune was not found, or if the tune already exists.

The eSpeak code uses `end_type` for the `voicingswitch` property
when used with consonants. It also allows `endtype` to be specified
in consonants if it is the same as `starttype`.

This code adds a check in the `starttype` and `endtype` handlers
to ensure that the phoneme type has been set to preserve the
eSpeak behaviour for these properties.

The 'dontlist' feature was used by the now removed PrintPhonemesUsed
function to not display that phoneme in the list. It was also only
used by the English phonemetable.

The 'fortis' feature is not used, so it has been removed.