added a pdf-parser for the psd-import
cosmetic changes to psd-import module
Merge branch '2.1.0' of https://github.com/CasparCG/Server into 2.1.0

Conflicts:
	modules/image/util/image_algorithms.cpp
preparing for allowing producers to supply own geometry:
* moved generation of texture coordinates for background-texture to vertex-shader
* using modelview-matrix for translations and scaling instead of manually multiplying coordinates
* added parsing of text-layer data
* added geometry to frames for custom rendering
* new text-producer using freetype
* new photoshop-parser for the scene-producer
added freetype to dependencies