Split up of mutt.h

Several new header files have been created by NeoMutt


mutt.h has been split up into a separate file for most of the structs within it.

New File Contains
address.h struct Address
alias.h struct Alias
body.h struct Body
content.h struct Content
context.h struct Context
enter_state.h struct EnterState
envelope.h struct Envelope
format_flags.h constants for mutt_formatString()
header.h struct Header
list.h struct List
mbyte_table.h struct MbCharTable
options.h enumeration for boolean options
parameter.h struct Parameter
pattern.h struct Pattern
state.h struct State
thread.h struct MuttThread
where.h an evil macro

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