Linux Build: Add MLT and dependent libraries. MLT not compiles yet.
Linux build: Migrate to squeeze buildroot. MLT builds fine now.
Linux Build: Enable SDL module for MLT. Nothing would work without it.
Linux build: Fix fallback configuration when JACK is not installed
Merge branch 'mlt'

* mlt: (35 commits)
  Linux build: Fix fallback configuration when JACK is not installed
  Linux Build: Enable SDL module for MLT. Nothing would work without it.
  Linux build: Migrate to squeeze buildroot. MLT builds fine now.
  Linux Build: Add MLT and dependent libraries. MLT not compiles yet.
  Fix Windows64 build (libmltsdl.dll was missing due to wrong path).)
  Fix build for Cygwin64/MinGW64 environment
  MinGW build fixes
  OSX build: Build MLT without Qt. Saves a lot of space.
  Fix MLT for Win64 build
  Remove "Import Sound File" menu item again
  Fixes for Cygwin build script
  Hide "Import Sound" menu item
  Fixes for MinGW croscompilation script
  Update MinGW crosscompile script
  Cygwin build: Cleanup
  Cygwin build: Fix packaging
  Cleanup
  Fix audio playback on Windows platform
  Cygwin build: Fix FFmpeg again. Cleanup.
  OSX build: Add MLT library
  ...
7zip is only for 64 bits
Legacy folder seems not to be listed at www.imagemagick.org.

Replaced with releases
Add MLT++ dependency to linux build script (Ubuntu case)
Linux Build: Set MLT environment (required for relocatable installation)
Linux build: TODO notes
Linux build: Add missing library
Change color for GroupSwitch
Linux Build: Add target architecture to MLT (allows to cross-compile 32bit binaries)
Spelling
Typo
Fix crash for Magick++, Gif and other targets utilizing init() function
Allow to pass --enable-warnings=fatal option for configure
Configure and build scripts for GTK3
Fix some includes
Replace Gdk::Drawable with Gdk::Window