DVB: added support for LATM AAC

To be used with DVB-T2.
Support for DVB-T2

Basic support for DVB-T2. New option for changing the channel switching approach.

Signed-off-by: xpc1000 <xavier_portell@hotmail.com>
Merge branch 'DVB-T2-Final' of https://github.com/xpc1000/mpc-hc into master.
Update Changelog.
Graph builder: Fix a memleak after 4ecbb12134f0820240333a99d197921ecf4b2f79.

Also fix the failed assert related to that in debug mode.
PPageSubStyle: Synchronize charset choice when opening the font selection dialog.
PPageSubStyle: Change relativeTo member type from BOOL to int.

The "relative to" checkbox is a three-state checkbox and should not be a boolean value.

Thanks to Lord for the tip.