New filters

[blattm]

• The OnlyPeHeaderFilter allows dumping only those tasks which contain a PeHeader. It can be used instead of the OnlyExecutableOrPeHeaderFilter.

• Additionaly an OnlyExecutableOrPeHeaderFilter allows dumping tasks which contain either a PeHeader or an executable memory region.

• The OwnPidFilter will exclude the memory of the unpacker itself. Without this filter, e.g. the OnlyPeHeaderFilter can match its own memory.

[danielplohmann]

thx!